Positive:
1) It comfortably fits up to a 15.6-inch laptop.
2) It is quite stable.
3) It cools the laptop to a satisfactory level.
4) You don't lose the USB port as it has a regular input on one side and an output on the back (allowing you to use the port normally by connecting other devices).
5) It is a good value for money if it is priced below 9-10 euros.
6) The fan is silent.
Negative:
1) It is made of cheap materials (which is understandable considering the price).
2) The legs to raise it to a height are stable but sensitive.
It is a good and affordable stand, but not suitable for old heavy laptops as there is a chance it may break