Well...
First of all, they have a beautiful design, very nice lighting and color patterns. I don't even remember the price I got them for, but I don't think it has changed since then. They have a sturdy construction with a hard cover on the sides and don't give you a plastic feel.
Secondly, they have good air flow, they didn't let the system or the graphics card or the liquid cooling go above their limits in summer and gaming conditions. Also, for 120mm fans, they are very quiet compared to other 120mm fans in the market.
The special thing about these fans is that you can connect them like "magnets", one next to the other, in order to connect the last one in the series to the hub of the controller. For example, each fan has two ports: one to connect one fan to another and one to connect the fan to the controller cable. This way, I was able to connect 3 pieces to one hub, which is how it should be done with this type of fans in the world. This makes it easier for you during the building process.
I don't know if the controller comes with the fans if you buy them as a package. In my case, the controller came with the liquid cooling box (120 sl V1, not V2 model 240 galahad).
To move on from the special topic and go to the serious part (at least for me), I gave it 4 stars because the controller can accommodate up to 4 hubs. In my build, I put 3 on top, 3 on the bottom, 1 exhaust at the back, and 2 on the liquid cooling.
The problem is not that, everything works fine, it's just that the liquid cooling came with a cable for the hub assuming that I would also connect the liquid cooling to the controller. The issue with the controller is its capacity, meaning instead of each hub having one port for power and one for RGB, it has one for power and one for RGB for each cable. So, for this reason, there was no more space for the liquid cooling, or rather, there was space but only for the RGB, so it wasn't a big issue, I just had to connect the RGB to the motherboard. With this issue, if I put all the fans in one mode, the liquid cooling won't follow because its RGB won't be connected to the controller, and I am forced to keep them permanently in rainbow mode, which becomes boring because the software works fine for the fans but not for the liquid cooling, which is not connected. I'm not sure if there is a solution, I just don't know it, and that's why I gave it 4/5.
Overall, they are wonderful for any build in terms of color and practicality.