Convenient as long as it lasted. In the first few months, one of the two hooks that the base attaches to broke. It still worked with just one. After about a year, the second one broke, so I threw it away. I don't think it's worth the money.

I don't know if it's worth its money. Plastic, which I wouldn't say is very stable. Personally, I have it against a wall, but if I bring it closer, it moves quite easily from the pressure of the feet. Also, despite my height (1.86), it seems quite short at the highest adjustment. Also, it doesn't lock in any position, so as you move your legs, it hits the floor.

It was purchased about a month ago. It is unique in how you adjust the reclining angle, as it is not locked in one position but moves depending on where you want it.
This is the only good thing about the product.
As for the negatives.
The plastic is of poor quality.
The hook that "attaches" to the base broke very easily.
The sliding from angle to angle is difficult, essentially causing the base to rub against the surface without any sliding mechanism.

Good quality plastic. I like the fact that it changes inclination with the pressure/position of the feet and I don't have to do it manually with a lever, for example.
Also important for me is the fact that precisely because it changes inclination with rolling, the part that 'rolls' to give the inclination is along the footrest, so it is not in danger of breaking due to pressure from the center.

It does its job just fine. The plus side is that it has the ability to change inclination and it is quite large in size, so taller people can comfortably use it. On the downside, you cannot stabilize the inclination at different points, but it's acceptable for its price.