Flawless construction, completely silent, meticulously designed aerodynamics for airflow. It is recommended as the top product in its category.

I have been using two of these fans for a little over six months.

Initially, I chose them and used them for liquid cooling (Corsair H110), having similar performance to Corsair fans and significantly lower noise.
Recently, I switched to air cooling, so these fans serve as intake fans for the case. Additionally, I use the included Ultra Low Noise Adapters to run them at low speeds and make them completely silent.

I am very satisfied with their performance so far, especially in liquid cooling, compared to the factory fans from Corsair. In indicative tests, the temperature of the hottest core (Intel i7 3770) reached 65 degrees in winter, while in summer it reached 75 degrees.

They have not presented any problems, and there is no such concern, with the 6-year warranty they have. Apart from the relative difficulty of installing the vibration-absorbing mounts, there is no serious drawback that characterizes them.

I would highly recommend them to anyone who considers their system worthy of such expensive and high-quality fans. Although their price is partially justified by what they offer (warranty, silence, performance, accessories), the majority of users can find good alternatives at half the price compared to these.