I bought Steelcase Think six month ago to replace my $50 chair, and while it is good chair with good price and comfy-but-firm seat cushion, it cannot solve my chronic "sore butt" problem. Half and hour in the chair and my butt soreness begin to appear. Doesn't help that I'm the type that sit in front of monitor all day. I know I need to move more frequently, or did some light exercise or stretching, but when you need to work, you need to sit anyway.
Then I read that the soreness is the result of lack of blood circulation, so I decide to give thing that improve it a try: a beads car seat. You know, the vintage-looking one taxi driver use.
THE SORENESS IS GONE. It's been several months since. Now I can sit all day long without feeling a thing.
Note that the version I use is the 'beads mat' with rubber texture on the bottom(This is important because it help prevent the beads seat from slipping)