I am very satisfied. So far, I sat for a maximum of 3 hrs at a stretch and its still comfortable. After 2 hours, my legs start getting cold, probably because the blood is not flowing there, after that I adjust the recline and it feels better.
http://weburbanist.com/2010/04/28/geeky-temptation-16-slick-...
so I hacked together a cheaper one.
It is still too early, I can post how I feel after couple of months.