They do a great job silently but at a high cost. The Corsair icue software also creates problems and is incompatible with certain programs. Also, there are too many cables and clutter like the lighting node commander pro, etc.
I have 6 of them

Beautiful RGB fans that also have the advantage of being in the Corsair ecosystem with iCue to synchronize all your peripherals. I use them as intake and I am very satisfied with their performance.
P.S. Corsair has now launched the QL series of fans, which are even more beautiful but still quite expensive

Due to their price and the complexity of connecting them to various hubs, lightin nodes, etc., I haven't purchased the Commander Pro and have them working with a universal fan hub. I installed 6 of them in the case and it cost a total of 240 euros just for the fans. They are very beautiful, well-made, and quiet with very good airflow. However, the money is a lot and there are cheaper ones with the same or better performance. I bought them because I have a Corsair case. The premium ones are paid for.

Very nice in terms of beauty, colors, but Corsair leads you to buy the Commander for 70€ in order to adjust the RGB and they don't have as good air flow as I expected

The fans are very good in terms of airflow and noise, and in appearance, they look even better in person than in videos. I give it 4 stars because Corsair makes you buy the Commander Pro for 65€ in order to control the speeds, while I paid 110€ for 3 fans that come with 2 hubs that are necessary for them to work. And if you also get the Commander Pro, make sure you have enough space in your case for the 3 hubs.

Simply beautiful the fans, many effects through the Corsair Link and quiet. Although quite expensive I give them 5 stars due to their appearance.