It was more wobbly than I expected from the photos (I suggest looking at some videos online) but I LOVE it. For reference, I am in my late twenties and I would say I’m in average shape. I am not sure how this would be for folks who are fairly frail, but I imagine it would be fine for most adults. With my usual office chairs I would feel stiff and sleepy after a few hours, and my lower back would start to feel compressed. This completely takes care of the problem, and it is nice to move around a little while sitting. I feel comfortable sitting in it all day. I have not been bothered by the lack of cushion, but my boyfriend found the seat a bit hard. I imagine this could be fixed by buying one of those thin round cushions and putting it on top. It is plastic so if I am wearing shorts I drape a T-shirt over the seat, otherwise it sticks to my thighs. When I wear long pants this is not a problem.