It is good, it does its job. Be careful not to connect it directly to the power supply, but to a controller that regulates the speed, as it ends up making excessive noise when running at full 12v. It requires a motherboard that can adjust rpm's or a fan controller

With Nvme WD black, the temperature dropped from 60 degrees while gaming to 35. Just keep in mind that the fan is always running at full speed.

I was skeptical at first if it does the job and how much noise it makes, etc. In the end, it does a good job. It works at 30c and below when idle. During a stress test, it only went up to 46c. With a room temperature of 22c. It is completely silent, really.

It does its job decently, reducing temperature by about -20%.
However, it depends on the implementation and the PC case. I installed it in a 980 pro Gen 4, in an SFF case, with limited space, with mesh sides, on my desk, and the noise from the fan (which is not PWM) at the default 14000rpm is more than annoying, it's like being at the dentist with a drill...
This can be solved with a BIOS adjustment, so the fan speeds can be controlled up to 12000 in games, 6000 - 8500 in desktop applications, and the noise is within satisfactory limits.

Unbelievable product for its price. Quality construction. Extra screws included for m2 ssd and magnetic (!) screwdriver. From 71c under stress, the adata pro 512g dropped to a maximum of 46. 32-35 idle during summer. Fan with 14000rpm is quiet. One of the best purchases I have made