I needed a comfortable chair that had a nice movement to it instead of a jagged motion... this fits the bill. I am able to roll around and rock back and forth with a fluid motion. I sat in many chairs and really had a tough time deciding but am happy I chose this one.
The sorina chair is very comfortable and the adjustments are very straightforward. I picked this chair because of the straight high back and the arms that fold up.
I've had this chair now for about three weeks and it's really comfy. I'm a designer and sit in it all day. It's way better than the previous chair I had.