I have a Swopper. It is great to play on but you cannot do all day in an office sitting on it working at the computer. No way. I've tried.
I used to have a Herman Millar Areon - it was great except when I had the arms down low and pivoted in it to play guitar, the front of the frame would make my leg numb.
I have a Humanscale Freedom Chair, the arms drop all the way down and it's a fantastic chair... though pricy. I've had it about 5-6 years now I think.
Oh Craig. LOL.My chair is titanium (light), comfortable, with no arms, rolls quickly (downhill), and turns on a dime.