Nothing special, fans with lights... it forces you to buy another set otherwise you have one fan left over.... they make a little noise, that's it....

For their price, they are decent. But with 40 euros for 5 fans, don't expect very good quality. In my opinion, the screws and their threads were very difficult for me to the point where you felt like you were creating the thread by hand. I have installed other fans that were not like this. Also, after half an hour of operation, one of the fans made an annoying noise from its bearing (it was well installed and it did it in almost all modes) I had to remove it because the noise was very sharp.

3 out of my 9 fans broke and started hitting excessively

Hey buddy, they're awesome!
They're really great value for money (in my opinion, they're worth more than the overpriced Corsair ones that cost you 100 bucks and give you the same result). The case includes x5 fans, x2 fan hubs, screws, and cables to connect them all in a Daisy Chain and have all the RGB end up in a single RGB 4-pin header on the motherboard. I'm amazed because for their price, the quality is exceptional and the lighting is very powerful, plus they're quiet! :)
(NOTE: the RGB changes from your motherboard's software.)

10/10

Very good air-flow, beautiful RGB, value for money! It's worth the 30-something € I paid for it. I replaced a CoolerMaster for aesthetic reasons, but I also noticed a difference in noise. If you don't adjust them from the BIOS, they can be quite loud! Just like all fans when they're running at high speeds! If you set them to low, you can't hear them at all. My motherboard's BIOS (Asus Maximus VIII Hero) had an automatic calibration, so I quickly sorted it out without any trouble. If yours doesn't have it, there are answers on YouTube for perfect RPM settings. However, my motherboard doesn't have an RGB header, so I connected them with a controller provided by Deepcool in their case!! Through the controller, there is no option for a rainbow effect. I suspect that even if I had an RGB header, they still wouldn't do it. I would recommend going for Deepcool CF120 in this case, for roughly the same price.

VFM fan as much as it gets. Silent and gorgeous. I installed 6 in lianli 011D and I have tremendous airflow and with the right fan curve, absolutely no noise at all! If the budget is tight, I recommend it!

In a price range of 35-40€, it is the best in terms of value for money for RGB case fans. It has intense and uniform lighting, excellent airflow, easy connectivity, and good temperatures (better than the previous NZXT and Enermax fans I had). In terms of noise, they are not completely silent, you can hear the air, but it is not bothersome, and I have my PC next to me. I have never had fans that make less noise, so I would say they are great!

The only negative is that on a Tomahawk Max motherboard (B450, with Dragon Center software), you don't get to enjoy them in their full glory because it only offers about 9 colors (red, orange, blue, light blue, green-blue, green, light green, dark purple, light purple). Any other color is one of the 9 in a different brightness, for example, white is light blue, pink is light blue, yellow is light green, etc. But this is obviously a motherboard issue, I just mentioned it so you keep it in mind.

Nice fans, good effects, low price.
The cooling is satisfactory with enough noise in high gears, although the sound is turbine-like and some people may like it.
One of the three that were installed after not even 6 months, while initially making a ticking sound every few seconds, now it rattles completely and you think it might even come off even at low speeds (it has obvious internal "play" in the axis and it's not the only one).
Here I should mention that they don't spin often because I don't game every day or for many hours. Maybe it happened to me.

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To make an update, a little while after my evaluation, while there is indeed play inside the fans, the rattling stopped on its own. Over 2 years later and the fans are still going strong.

I happen to have my (Lian Li PC-O11 Dynamic Black) case on the right side as I play, and the air hits it and cools it down. I got 5 of them for 40 euros on sale. It has lowered the temperature of my graphics card (RTX 2080 MSI Gaming X Trio) by 15-20 degrees, and they run at 60% on stream with full graphics, even after many hours of gaming (Modern Warfare).

Guys, they are really good, they are the most value-for-money fans compared to other companies that sell fans with the same quality at crazy prices of 100€+. They cool the computer perfectly and you can get a splitter if they don't all fit in your motherboard. The only negative thing is the noise, but their light is simply perfect, countless options that can match your whole PC.