Other options (Score 3, Insightful)

There ARE competitors to the Aeron, in many other styles... Check out Knoll Office Seating, the ergonomics that go into these chairs is really amazing. If you can stomach the prices, then by all means, your back WILL thank you at the end of a long day. Make sure you buy a properly sized chair (*the aeron comes in 3 sizes) and if you buy some other chair, make sure he adjusts it to where his posture is set right. I have a couple of Knoll Life chairs at home, I can personally recommend them as super comfortable, and they come in a million different color combinations. Oh.. And they'll outlast anything from ikea or office depot.