The positives of it are that it does a very good job. In a 12-year-old Sony Vaio, it reduces the temperature by 15-20 degrees (indications from the HWiNFO64 program). It has fan speed adjustment, which means you can adjust the cooling level and consequently the generated noise. As for the noise relative to the cooling it provides, it is satisfactory. It also has many accessories to easily adapt to different laptop models. In my own laptop, it performs much better than any stand I have purchased (with 1 or 2 fans).
The only negative thing I found is that it does not have a long lifespan (hence the 2 stars). I have had it for about 1 month, I don't use it constantly, and it broke. Initially, it made a noise that later became very loud and now it no longer produces air.
It states that it has a 2-year warranty. I will return it to the store and we will see...
The product would be perfect if it could withstand the test of time.

It could be a little cheaper. It has quite a few components. If someone buys an extra power supply and sets it up to 6 volts, it doesn't overheat even with 25 programs running. STRICTLY UP TO 6 VOLTS. I accidentally put more and it burned out.

It does a better job than a fan base, for the T420 that I have. I would highly recommend it.

The product does its job and keeps any laptop cool, but it constantly breaks within a very short period of time and I have already replaced it once. After 1-2 weeks, it starts making a loud noise as if the fan is hitting something from the inside (this also happened with the second replacement).

Do not use Chinese components in a laptop, especially in the cooling area. If a laptop has a cooling problem, you should open it up to clean it, change the fan inside, or check the thermal paste if it is overheating.

Good for its price, but don't expect it to do an amazing job. It's just to prevent your laptop from overheating. It has nothing to do with the base, it's just small in size and convenient

It could have a stronger fan to produce more hot air, but for its price, it is worth it for anyone who has a problem with their laptop overheating.

Good cooler at a good price, but a bit noisy at its maximum!!

It helps a lot because the internal fan of my laptop seems to be a bit worn out.

UPDATE 10/2018: It broke down, the fan doesn't start. I had opened it a couple of times to clean it.