4 stars because the fans make a lot of noise. Otherwise, it is very practical: excellent metal construction (with the only disadvantage being that there is no replacement if you lose a rubber band), stable, etc. Personally, I have had it for almost 7 years.

OK, sturdy base but:

1. The rubber pads broke and the laptop keeps sliding down. Edit: I made my own bases with a silicone gun.
2. It makes A LOT OF NOISE!!! I had to disconnect the fans. Edit: I opened them, cleaned them, and applied WD 40. Finally, the noise disappeared!

Very good product. Also, with the fans changed to 12V 140MM with a USB voltage rectifier from eBay, the temperatures are lower than expected (+30€ cost for the rectifier & fans)

Satisfactory for its price. One fan stopped spinning at some point because it was obstructed by its "cage". But I might have accidentally stepped on it. Once I fixed it, it started spinning again.

Well done to Coolermaster.
They made a perfect stand that other companies should imitate.
The main thing is that it has rubber and the laptop does not move.
It is designed to also be a case with a rubber handle for carrying the laptop.
The two fans can be moved wherever you want.
The USB connector can also be used for another external device as it is male-female.
It has 2 rubber positions at the back for securing cables.
So it is the best. Get it.

Convenient base, I've had it for over a year but the fans are very noisy, they get in your head, sometimes they stop and you have to hit them, also their legs are very sensitive to adjust them otherwise if you change their position they are in danger of breaking. As a cooling system, it's mediocre, it doesn't cover all the areas you want, even on a 5-month-old gaming computer. The fans, although visually the same as the U3, are not at all the same, I've had them for the same period of time and their performance differs greatly.

Average product from CoolerMaster in my opinion.
The fans have no power at all and sometimes they are very noisy.
One fan from the beginning when I bought this stand sometimes didn't work and if I gave it a slap, it would start.
And two out of the four legs of one fan were broken.

It cools very well due to the movement of the fans in the areas that need it. Good and lightweight construction, relatively low noise level. Very convenient if you move your laptop because the base becomes one with it (it goes in from the bottom side of the base) and both fit in the laptop case.
As for the negatives, sometimes the fan blades touch the plastic, making noise and you need to move them a little to get them back in place. However, small drawback, great performance!

Very practical base, the fans can be placed wherever you want on the base depending on the point where each laptop needs it, and it solves the temperature problem with just a couple of clicks. I highly recommend it for anyone looking for a value for money product.