As a first impression, completely satisfied with the purchase. Quiet and everything works perfectly in terms of cooling. Having a black case with glass, the white LED is very impressive. For now, it is barely audible

This specific cooler master fan definitely cools well and has a strong LED lighting.

By placing 2 as case fans, in the top-exhaust position, one can feel a significant airflow by placing their hand above the case, even with the presence of a magnetic dust filter. The temperature on the motherboard (VRM) dropped by at least 2-3 degrees Celsius after installing them in this position, compared to other PWM fans with lower RPM according to specifications. The temperature of the GPU also improved. (Tested with stress test & idle conditions)

This particular - updated Sickleflow series does not suffer from the issue of excessive noise that most powerful coolermaster fans have (except for the silencio series, which, however, has lower specs in terms of airflow/static pressure). However, you will definitely hear these fans at max RPM, but in a tolerable way in my opinion. Given the PWM adjustment, the increase to max RPM is expected to be generally rare, depending on your case + CPU + GPU + the settings you choose.

The specs of this particular series indicate that they can be installed both in a case and in a CPU cooler, even on a radiator, due to the high static pressure they achieve.
[However, buyers should keep in mind that the airflow & air pressure values published by manufacturers are mainly nominal!]

A partially negative aspect might be the relatively large size/thickness of the fan base for a 120mm fan, as it may make installation difficult in certain cases/air or water coolers. Also, the bases of the provided mounting screws are slightly narrower than expected, in my opinion.

The built-in LED spreads across the entire diameter of the fan and also noticeably illuminates the case, without being excessive in brightness (the white shade helps). Those who do not have a motherboard with RGB/ARGB capability or do not prefer it (I belong to this group), or do not want to deal with color inaccuracies/incompatibilities, I believe they will not be disappointed. However, the LED issue is purely a matter of personal preference.

In terms of reliability, I cannot judge as the fans have only been used for 2-3 weeks.
However, it is encouraging that they feature Rifle Bearing technology according to the manufacturer.

Given the selling price, it is definitely a value-for-money fan choice!