I have it on top of another pillow, not just by itself. And with both, I can sit for a long time at work. It is good for circulation with small movements. Yes, it is relatively small but not that it needs to be bigger, but you don't feel "lateral support". For its price, it is fine and I hope it is really cool in the summer.

Tragic. Poor quality, doesn't resemble the photo, and has terribly small dimensions. Not suitable for adults. It is also uncomfortable

Effectiveness under mediocre!
It is not completely useless.
Even in the thickest point, it is not enough since it becomes almost flat when you sit down, I am only 65kg, it fits me in size but it will be small for many.
For an egg, not by any means, even the chickens laugh!

It does its job but it is small in size. I found it larger than similar ones. The thickness is not uniform but it is half at one end. Thicker, however, than a similar one that I bought. But then we move on to medical ones that increase in price a lot.

It is the worst, it is made for excessively small people (under 1.40). It is not worth even 1 euro. Terrible construction quality and destructive for the body as it is worse than sitting on wood.

It's not as amazing and good as I imagined, for sure if I sit on an egg we will cry for the egg afterwards... It does its job and has helped the person who bought it so that their tailbone doesn't hurt.... I don't know if it's a negative or if there's a reason they made it like that, it's the size that even though it's the largest, it only covers part of the chair and not the whole thing