Very good. Silent unless you increase your demands but within reasonable limits. Important to check if your box can accommodate it because it has a very large volume.

I will start with the positives: It has very good performance. I use it with a Ryzen 7 5800x processor, which from what I have read can reach temperatures up to 70 degrees, and its temperature does not exceed 40 to 41 degrees. Also, it is very economical, but unfortunately, there is a reason for that.
Now for the negatives: Although it is not poorly made, the collars on the tubes (e.g., where it connects to the processor fan) are plastic and not metal, as it seems.
The biggest disadvantage, however, is that it is huge! You can't find a case even with bullets. Only in full tower and still not in all of them. I ended up getting the BeQuiet 802, which is huge and still had to remove the base it has for the fans, and one side panel does not fit well because its clips hit the cooler.
Before you buy it, check that you have or are willing to acquire one of the few cases that can accommodate it.

Excellent water cooling. It was installed on an AMD 3700x that was running with the Wraith Prism cooler at 75 degrees, and now with this specific water cooling, the temperature has dropped to 45. Easy to install in the Lian Li Lancool III case. One cable connects to the CPU pump and powers both the pump and all three fans.

Top choice Value For Money.
Pay attention to the dimensions, it fits in very few Full Tower cases on the market. Check the dimensions and do not trust the case manuals.

I paired it with an AMD RYZEN 7950X and a BeQuiet 900 Rev. 2.0 case.

Very good performance with idle temperatures of 45c-50c, gaming temperatures of 75c-80c, and Workloads temperatures of 88c with 6 fans inside the case and a Push Pull configuration for the liquid cooling placed on the front of the case (it couldn't fit anywhere else). Room temperature is 20-21 degrees.

They sent me a replacement within the warranty period, which was announced by the company itself, and the noise and synchronization were greatly reduced.

For its price, it's the best purchase. The lifespan will show, I've had it for 1 year.

19/7/24 1 year of operation
I put it in a be quiet silent 802 case on the front side with the tubes from the bottom side (cooler in an upright position) to avoid any air bubbles. I had difficulty installing it, but I had never installed liquid cooling before, but it was worth every, and I mean every, euro. The 14-core processor doesn't go above 60 degrees Celsius in games and at most 65 degrees Celsius under stress. Guys, this liquid cooling is simply AMAZING!!! With an i5 13600 K, you can play everything up to 144 Hz with a 7900 xt :D

Perhaps the best 420-liter refrigerator on the market at a very good price for what it offers and with a significant difference being the quietest in terms of hydrocooling. I think it is overkill for most processors.

I have installed it for about a year now on a Ryzen 5 3600x, everything is good so far. Extremely quiet for such a big cooler.
The installation was relatively easy in the CoolerMaster Masterbox TD500 Mesh Gaming Midi Tower since I had never attempted water cooling before. It fit perfectly though.
Now time will tell for further evaluation.

I installed it yesterday on socket 1151 and I am extremely excited. I haven't seen temperatures above 30 degrees and there is no noise at all. I came from a cooler master ml360r and it's like day and night. It's a drastic change from 60-80 degrees to 22-26 degrees. I highly recommend it

Pay attention to the QC PASSED sticker. (It is on the box and on the inside (tube side) of the refrigerator.
If it doesn't have it, then refer to the Arctic website, https://www.arctic.de/en/lf-service-kit
for the service kit or request a replacement with a refurbished or newer one.
https://youtu.be/jHdEqWpexH0

Amazing aio coming from nzxt x 62 - 5c with 9900k.
With 100€, such a beast is a steal! I have a thermaltake View 71 case and it fit comfortably on the top. - 5c on vrm with the mini fan next to the pump! I believe it's not worth the extra 200€ for the lights on the pump like z73.. Well done arctic, I didn't expect it!

The best performing AIO liquid cooler on the market by far, especially for RYZEN, as it features a mechanism for offset installation (check out the relevant video with the test by GamersNexus on YouTube)

Although I usually use good Air Cooling (Noctua, Bequiet, etc.), this specific liquid cooling system impressed me in every aspect, so I decided to get it.... truly, for me, it is the best liquid cooling (AIO) that you can install in a PC right now! (You need to check your case first due to its size and more, I must say...)

Definitely check your case before purchasing this beast. I had to modify the box to fit it in. After that, it fit perfectly.
Great job thermally on my i7 (oc 4ghz 1.2volt), it reaches 35c at idle with the fans (pwm) and pump. Once it reaches 100%, it goes up to 67c with 72c without having 100% fans, they go up on their own at 70 to 80. Ambient temp 25c.

The fan on the pump, which cools the vrm, is very important! I saw a 4c difference! Where it used to reach 63c, now it's at 59c, it does the job!
Finally, it's truly silent.
Excellent value for money if you have the necessary space, of course.

Awesome this water cooling, I have the 5600x with pbo 2 at 4800Mhz and the water cooling doesn't even notice it, but the cooler is big and in the end I put it on top until I get a monster case to put it in, I am very satisfied

One of the best AiO coolers I have worked with. Installed on a 5950X, idle temperatures range from 30-35 degrees, medium load temperatures range from 40-45 degrees, and under stress tests like Cinebench/OCCT/CPU-Z, it reaches a maximum of 62 degrees.

Especially for Ryzen CPUs, it has a mounting offset to ensure proper installation. Impressive temperatures for this beast.

Quiet, much quieter than I expected, especially with the PWM from the case (BeQuiet Silent Base 802).

On the other hand, installation is not exactly difficult, but it can be a bit tricky and unnecessarily complex. However, it is worth the effort.

I put it on an i7 9700k with overclock 5000mhz temperature at full load 100% 76 degrees, in gaming only 45. It is silent, you can't even hear it when the fans are running at 100%. The only thing to be careful about is to check if it fits in the case, I put it on the outside. 10/10 from me

I just became the owner of this specific cooler, it's a beast. From the cooling I had (240 A-RGB), it should have -5 degrees lower as I see it

One of the best liquid coolers on the market and clearly the best cooling for the money. Of course, if you can fit it!

Quiet for liquid cooling, cools very satisfactorily, and the best part? It connects to the PC with just one fan connector!

Detailed review: https://www.youtube.com/watch?v=ACyqEyGtcl8

I don't use it on a PC, but I replaced it with a Thermaltake RGB 360 and it cools 10 degrees lower, and much quieter both the pump and the fans.

If you don't mind the RGB and the size (it's huge), then it's a great opportunity for the money.

If you are looking for a large and quiet AIO, you should place the Arctic Freezer II 420 at the top of your list as it is an excellent product!

Advantages
• Affordable price (given its features)
• Good performance
• Quiet operation
• High build quality
• FDB fans with PWM speed control
• All-in-one system connection with a single cable

Disadvantages
• The lack of RGB lighting may be a problem for some
• Huge radiator and fairly large block

Check out the full review by Hardware Busters here: https://youtu.be/nSb5AKn5rlI

Wow, what a beast this is!!!
Unfortunately, I still can't try it out, but I will return soon.
But the first impression is that it is really huge and with a very thick radiator compared to some 360, 240, and 280 ones I had!!! And the price is dirt cheap!! Hopefully, its performance will match its appearance, we will see in a few days. I will also need a case... a photo on the Puritas cougar that is not a small case and it almost covers the entire length.
It easily outperformed the 10700k up to 5.1, easily covering all modern high-end CPUs with good overclocking, but it needs a big case to be installed.