In my case, the build was with a plain 5600G without a graphics card, so I didn't have many objections since the customer specifically wanted this case. Unfortunately, this is the only case where I might recommend it.

For HDD installation, one side goes in smoothly and the other is screw-mounted. Of course, it's not something that will take up much of your time. However, there are plenty of slots for 2.5" drives. The PCI brackets are integrated into the case and not screw-mounted, which means that once you break them to fit, for example, a GPU, they become useless, with all that implies.

The fan speed is permanently set at 100% and they only connect to the available controller. There is no connection to the motherboard anywhere, nor for RGB. Lighting control is only done with the button on the case or with the provided remote control. It has many available modes though. Fortunately, the fans don't make much noise, if there isn't relative silence, they're not very audible.

The lack of airflow is a serious problem. It reminded me of the bequiet pure series. Without the front glass, the CPU temperature dropped by 6 degrees.

If you want good build quality and mainly appearance at a decent price (not over €80), it's an okay option. Would I use it again in a build? Definitely not, in the price range of 80-100, there are much more worthy cases (and with RGB).

I write more reviews to give advice to those who have it and to those who are thinking of buying it.
Initially, my own case "hosts" an MSI B450 Tomahawk Max, a Ryzen 5 3600, an Asus GTX 1660 Super OC rog strix, 16gb Ram, 1 SSD nvme, and 1 HDD. On top of the processor, the Arctic eSport 34 Duo with Arctic's mx-4 paste has been placed.
For build quality and specs, countless reviews here or on foreign forums cover it.
I will talk about airflow and temperatures. With the 4 pre-installed fans + the cooler, temperature values ranged from 35-45c at idle. However, the case generally heats up during heavy gaming, due to the insufficient airflow caused by the front glass.
I have read below that there are no Kolink fans available to add or replace. So, I sent an email to Kolink on 28/12 and asked them where one can find their fans to purchase. To cut it short, today I received 3 fans that they sent me completely free of charge, after I first sent them the purchase receipt. One of them was placed above the cooler and already in today's measurements, the processor ranges from 29(!)-38c at idle.
In summary, it is a good case for its price, but with a few more euros, one can get something much better and not go through the process of sending emails, etc. to find fans to cover the case's manufacturing inadequacy.
P.S.: Those of you who already have it and are within the warranty period (2 years) can send them an email ([email protected] with the subject Sales) and request as many fans as you need. I hope I helped!

First of all, let me mention that for its price, it is an incredibly value for money product. It comes with 4 RGB fans, which are quite silent, I would say... Now, the basics. Average airflow (I wouldn't choose it for a PC that is solely for gaming and for long hours). It was built with a 3800x stock cooler and a Gigabyte RTX3060Ti. With the 4 fans that the PC had, it was overheating... Really. The GPU reached 80 degrees and overall, you could tell that the PC was very hot from the tempered glass, which was really hot after an hour of gaming. And that's how we got to the result in the photo... We shared another case with two other people and ended up with 6 identical fans, while one person put their 6 fans in the remaining case. Now I can say that something happened. In the photo, you can see my computer with a GTX1060 G1 Gaming 3GB and a Ryzen 2700x, both at stock speeds. In heavy gaming, it doesn't heat up as much because the airflow is very good with the 3 intake and 3 exhaust fans... But still, for gaming for many hours, you can tell that the case retains hot air inside. Definitely, if you put more powerful fans, you will have much better results. Now, two more negatives that I noticed were that in order to find the same fans, you have to, as I mentioned above, either buy another case or find someone who doesn't want them. Now, regarding their speed, I found only one way to increase it. I took the RGB box from the second case, connected it to a different molex than the old one, and put 3+3 fans separately... The second negative is that it doesn't have much space for cable management at the back... A very negative thing for me personally, who wants everything to be neat. Overall, for 90 euros, it's fine!

Edit: 5/9/2022
The case has served me well throughout the summer... I got a white power supply, changed the fans on the cooler to white ones, and now it looks beautiful... And a tip if you have an air compressor or compressed air: REMOVE the front glass completely and keep it somewhere safe along with the screws... It makes a huge difference in temperatures... The PC has changed dramatically in terms of temperatures and dust!

Model Type: Kolink Observatory
Type: Midi-Tower
Material: SGCC Steel, Tempered Glass
Colors: White and Black
Motherboard Support: Mini-ITX, Micro-ATX, ATX, E-ATX
Weight: 6.8 Kg
Price: 78 euros
Warranty: 2 years
External Design: Beautiful due to RGB lighting
I/O Panel: 1x USB 3.0, 2x USB 2.0, Audio combo jack, empty USB 3.1 Type-C slot, Power, Reset, RGB buttons
Expansion Slots (PCIe): 7
Pre-installed fans: Front: 3x 120mm RGB, Rear: 1x 120mm RGB
Fan Support: Front: 3x 120mm, Top: 2x 120mm, Rear: 1x 120mm
Fan Type: 3x Kolink (120mm, 12V, 0.22A). Most likely sleeve bearing
RGB controller: Yes, and it also comes with a wireless remote. Cheap but gets the job done.
AIO Cooler Support: Front: 120/140/240/280mm, Top: 120/140/240, Rear: 120mm
Storage Support: 2x 3.5", 5x 2.5"
Dust Filters: 2x (Top Magnetic, Bottom Sliding)
CPU Cooler Height (Maximum): 160mm
VGA Length (Maximum): 380mm
PSU Length (Maximum): Comfortably fits 160-180mm.
PSU Support: ATX, Bottom Mount
Cable Management Support: Basic, some cable ties. No channels for cables on the back and limited space behind the motherboard (18mm).
System Installation Ease: Although space is not abundant, it is not difficult to install the motherboard and other components. You just need to remove the necessary PCIe covers before installing the motherboard, otherwise you won't be able to later and will have to remove it. Installing SSDs is easy, but the same cannot be said for hard drives. It is best to install the latter before installing the power supply! The holes for routing cables are quite large, but they are not covered with plastic grommets, so the cables will be visible on the back of the case and the result won't be as aesthetically pleasing. Lastly, the cutout behind the CPU socket is large, so you won't have any issues with installing CPU coolers.
Noise Dampening: Moderate because the case has thin panels and there is no material for noise dampening inside. At this price, however, I didn't expect anything like that.
What really bothers me though is that there is no fan speed control, and the fans run constantly at 1300 RPM with an operating noise of 33.8 dBA at one meter distance. If you want to build a quiet system, I would not recommend this case at all.
Thermal Performance: I did not bother to take thermal performance measurements for the following reasons. It is a low-cost case that focuses not on performance but on appearance. The glass on the front may look nice, but it literally kills the airflow of the front fans, as they cannot pull in enough air. So if I put a load inside this case, the most likely outcome is that I will burn my expensive thermal loader.
Conclusion
My observations for this budget yet stylish case are as follows:
• Poor airflow from the front fans because they are stuck to the glass. For better performance, you will need to remove the front glass.
• The placement of hard drives could have been much easier if there were removable trays.
• There are no covers on the cable routing holes for a neater appearance.
• 18mm gap, quite small, at the back of the motherboard and 24mm on the side of the power supply.
• If you don't connect the fans in the corresponding ports on the RGB controller, they won't work properly. Additionally, the fans have incompatible connectors, so if the RGB controller or any of the fans break, good luck finding compatible components. This is a major drawback. They should have used conventional connectors, 3-pin or 4-pin.
• The fans run at full speed constantly, without any ability to control their RPM. Thankfully, they are low-speed fans, but the lack of fan speed control reminds me of past decades.
• There is no instruction manual included in the packaging, you will have to download it from the Kolink website. You can also find an online manual for installing the fan/RGB controller.
• Removable, magnetic dust filters on the top. There is also one on the bottom, in the position of the power supply.
• It can accommodate up to two 3.5" drives and five 2.5" drives.
• The top of the power supply cover does not have any openings, so you should not use a passive PSU. Also, if you install a semi-passive PSU, it is advisable not to have the fan facing upwards, as it will release the temperature inside the PSU compartment and increase the overall temperature of the case.
• The distance from the top of the motherboard, where the VRMs are usually located, to the top of the case is small (25mm), so it will be difficult to fit 140mm fans.
• Maximum graphics card length is 380mm and maximum CPU cooler height is 160mm, so it will not accommodate bulky coolers or large graphics cards. Again, this case is not designed for power-hungry hardware.
• The I/O panel has multiple ports and all the necessary switches (Power, Reset, RGB).
• It can fit a 280mm radiator in the front and a 240mm radiator on the top. If you want to install liquid cooling in this case, avoid the front part at all costs.
• The positive aspects include the good price considering that you get a visually appealing case with a glass side panel, four RGB fans, an RGB controller, and a wireless controller.
In general, this is a case that is aimed at users who prioritize appearance over performance. Do not buy it if you plan to combine it with very power-hungry hardware, as it is likely that everything inside will overheat. Another thing you can do for better performance is to completely remove the front glass and increase the airflow towards the trio of fans. However, there is no front dust filter, so you will have to clean the system regularly. For 78 euros, it's not bad considering that it includes 4 fans, but compromises have been made in many areas to achieve this price.

Positive
• Good price
• 4x RGB fans
• RGB controller with wireless control capability
• Rich I/O panel (only missing Type-C port)
• Side glass panel
• Magnetic filter on top and slide-out filter on bottom
• Accommodates large coolers, graphics cards, and power supplies, considering its price and capabilities
• Several cable management holes and a large CPU cutout

Cons
• Front fans are greatly restricted due to the glass panel
• Cheap construction overall
• Fans and RGB/fan controller have specialized connectors, so you cannot use other fans
• No fan speed control capability
• Low-quality fans
• Difficult to install hard drives
• Limited space behind the motherboard
• Limited cable management options
• Lack of covers for cable routing holes

Watch the video review here: https://youtu.be/YMOgY7se1v0