Very good for its price, and the RGB is also very good and completely silent, but there is a huge "but". And let me explain, in the low noise mode, sometimes (about half the time) it doesn't turn on one or both fans! You have to either press the mode button or manually turn them on to get them working. Either way, it works correctly. In other words, you have to open the case to adjust them. I'm mentioning this because I personally chose them for their silent operation (I use them in low mode) and in the end, I will end up using them in high speed. I should note that even in high speed, the noise is tolerable and minimal, but it is more than in low mode.

The only downside is that they are not adjusted by an application on the computer and are adjusted manually.... Otherwise, very nice fans with beautiful colors!

The only observation I have to make is that they are not software-adjustable from the pc, but if I could, I would give them 10 stars!!

Good evening, first of all the fans are beautiful and have a very good construction and design. They provide good airflow throughout the case and come with 1 controller with 3 sets of screws for installation and some spare parts. I give 4 stars because you have to manually change the colors and not through a program, which didn't bother me much since I always have everything in one color for all my RGB supported items. They have 3 functions: 1) spectrum cycling, going through all 16.8 million colors, and there is a button to stop at the current color, 2) low profile mode, which means less noise without sacrificing (at least for me) any performance, and 3) pre-set profiles to have the color of your choice at hand. For those who purchase them, I recommend placing them in the front of the case if possible (I have the P400 case) for a direct and faster color change

4 stars, why:
1. The colors cannot be adjusted to your liking through the PC, only with the controller, so any change you want to make has to be done manually. (Also, it is a 5-pin, so you cannot directly connect it to the motherboard)
2. I cannot find ANYWHERE (no, I didn't lose it, it simply doesn't exist) the cable that connects the controllers together, so whenever I want to put them on cycling mode, I have to do it by eye.
Other than that, they are beautiful, which is why I only deducted 1 star. If I had the connector for the 2 controllers, I would give it 5 stars, even if I have to change them myself every time.