I love how it automatically works my core and I don't even realize it! My back was a little sore after the first day, but only because it's building up strength. Love it!
I love this chair. It's more comfortable than I imagined it would be. The wheels work great and you can get around nicely in it. I don't use the back rest too often, but when I do it's nice to have. I do notice my posture is better! It's a little lower than my old office chair, but I think it fits my desk perfectly. I am so glad I went with this chair.
I'm 5'11" and initially bought the standard chair. Ended up buying the extensions and it made a huge difference. The chair is very comfortable. I haven't used it long enough to say more about it but it definitely seems very promising.
I bought this chair about a month ago and it is a very disappointing purchase. I am 5' feet and my legs and feet hurt a lot while sitting in the chair. Also it is too low and my arms get tired because the desks are usually high. I wish I could have returned it, but I don't have the box anymore.
I love this. It makes me sit straighter and I feel like my posture is better. The seat is maybe not as tall as my previous chair, but I'm not hitting the pull out keyboard with my knees anymore. (I'm 5'8") The back rest is very comfortable. The only reason I don't give this 5 stars is because the directions are horrible. It's simply a sheet of paper with pictures. It wasn't difficult to put together; it took me about 15-20 minutes.
I've always wanted to try one of these chairs and I am so happy with it. It is comfortable and easy to put together. I love it! Definitely get the leg extenders though