Quite good and quality fans from aerocool, a relatively more budget company. Advantages: they are silent, very nice lighting with many settings, very good airflow, the plastic is quite quality and doesn't smell like Chinese OEMs.
The only disadvantage is perhaps the installation because it doesn't include a normal manual for easy installation, so someone who doesn't have much experience will struggle a little.

Very good purchase. It was combined with 3 other fans of the same series, so the hub was fully covered. It has been working flawlessly from the first moment and has not presented any issues with voltage or RGB reset. It was connected to a Gigabyte motherboard and I had to initially adjust the hub to receive commands from the motherboard for the RGB effects using the included remote control, otherwise it wouldn't work with the Fusion 2 platform. I should mention that even without connecting the controller to the 3-pin 5v on the motherboard, the RGB still works and can be changed in two other ways. Either through the remote control or by connecting the case's reset cable from the front panel to the reset indication on the hub.

One complaint is that at low speeds, the fan produces a synchronization noise, most likely a manufacturing issue, and it is noticeable to me with the case on the desk.

Extremely bright and slim LED ring fans. They come with a flexible ARGB/PWM controller. You can adjust the fan speeds manually or automatically by connecting the PWM cable to the corresponding 4-pin slot on the motherboard. The same applies to controlling the LED lights, either manually by selecting one of the programs or by connecting the controller to the ARGB slot on the motherboard.

The controller supports 6 (6-pin) fans and 2 ARGB LED strips. Please refer to the image for the connection diagram to know what you are purchasing.

For a mid-range PC, it is just what you need, a mid case, R5 3600x, RTX 2060 cools them satisfactorily, the difference is noticeable without extra cooling. However, it does not have software to change the fan speed according to the temperature, but even if you leave it permanently at max, it does not make noise or consume much power. The controller is quite easy to use, you can increase/decrease the fan speed from there, as well as change RGB profiles/colors. Another positive aspect is that the package includes a hub with 6 6-pin ports for fans. So, if your motherboard only has room for 1 extra, you don't need to worry. However, you need to have 1 SATA cable to connect it to your power supply.

P.S.: For any purchase of extra fans with RGB, check if your motherboard has the appropriate port. In the B450m ds3h that I have, it does not have one (however, the RGB works fine for some strange reason).

I have had these headphones for about 3 months now and I am very satisfied. They have nice colors. They have a simple hub... They are simply perfect. I highly recommend them

Nice hub simple packaging (just mentioning it for the packaging)
I wouldn't say it's noisy, especially in a Sharkoon Pure Stil case with positive pressure, placing it at the bottom or on the side, and using a Scythe Fuma 2. I wouldn't consider it annoying, especially when compared to the 13 fans in my PC and the fans on my GPU at 70% load.
(just mentioning it to justify the airflow and noise) The temperatures are almost the same as my previous fans, which had 52 cfs.
If I find one negative, it's the voltage drop when the fans are not at full RPM. I notice a voltage drop in the last two fans (5th and 6th fan) in the RGB effect, meaning the color fades or momentarily changes, but the other 4 are okay

It's worth it because, unlike other fans, it only has one 6-pin cable that connects directly to the convenient hub it has. It also has the controller that makes changing colors, speeds, etc. very easy and you don't need to connect many cables to the motherboard or anywhere else, just with a remote control and you won't have any confusion. I highly recommend it.