These fans are very high quality. This is truly a quiet fan, the best I had. At full speed they hum in lower pitch and are very pleasant. Lower quality fans are annoying at high speed. I bought a total of 7 fans for my case. They pay attention to details. The built construction is exceptional, the center sticker is spot on dead centre which is rare as most fan manufacturers don't pay attention to this. The blades have grooves on them and when they spin you can see really nice texture effect and near perfect circular centre sticker along with soft glow rgb.

This is a perfect example of you pay for what you get. Sure they are expensive but they are also of the highest quality and if you value quality and performance, they are for you.