I haven't had it for long, but it does what it advertises and what you would expect for the price.
Very quiet and with decent airflow, although I haven't pushed it too hard yet, it doesn't seem to lack anywhere.

The fans are unbeatable for their price, I found my peace. Quiet, efficient cooling and low cost. I recommend them, especially for micro ATX builds. If you have a micro ATX case (like me), truly 10/10. If you have a mid tower, go for 140mm fans (if your case supports it), for better airflow and lower noise, although these are relatively quiet.

Overall, a very good fan.

+ Quite low noise. It's not completely silent, which also depends on its placement, but it definitely doesn't bother.
+ Nice, uniform lighting.
+ Also, and most importantly, satisfactory cooling.
+ Finally, a very sturdy frame construction and a nice touch are the integrated rubber anti-vibration pads on the four corners.

Overall, I am very satisfied and that's why I bought a second one as a backup.
Obviously, it's not the best option out there (it can't be compared to bequiet! or noctua, etc.), but for €6.9, it's a decent choice.

I have bought 3 and installed them on my PC, they cool very well, and the color is very vibrant and illuminates very nicely, great value for money.

I bought 6 fans in all colors except white, I put 5 of them in the box on top of the control fan and 1 on the cooler. They are very good and quiet even at maximum speed of the control fan.

One downside is that without the control fan, their lighting is very strong and depending on their intensity, the brightness decreases or increases.