It's awesome to sit on, even sitting 10 hours a day I have no back aches at all. I'm thrilled :-) Compared to the chair I used to have, it's no contest. I think part of it is the size - my old chair was probably too big for me. But the main reason is definitely the balancing seat. I thought at first it might be annoying, but it's actually very pleasant. The chair is easy to handle, too. In short, amazing.
All the best :-)