They look nice, and move a decent amount of air.

Everything. -Build quality -LED quality -Software bugs -Noise

So I've had nothing with issues from all of my Corsair components in my build. Not one thing from them hasn't been defective. I've had 2 of these fans stop spinning on me, making an awful grinding noise and now all the fans connected to the controller are bugging out, causing the LEDs to flash random colours when it's on any setting other than "Solid". I'm beyond disappointed as I spent well over $1000 on Corsair components and accessories because I really liked how seamlessly everything works and one would think they're a quality company making quality products, maybe one day in the past but now, now they've gone down the path most others make the mistake of taking. Cutting costs on products, reducing quality and customer experience, while raising the prices on everything giving it that "premium" feel. Corsair needs to change something quickly if they want to remain at the top, because other companies in the industry actually care and want to do good things in the this space, not rip everyone and their grandmother off. Never again Corsair.