Why does everyone buy Aeron chairs for programmers?
dave_au:  I have a friend who does his programming from an armchair and I often wonder how long it's going to be until his wrists start to be effected by the massively subergonomic elbow/wrist placement that it forces on him.Anecdotally, my sister is a chiropractor and the Aeron (when properly adjusted, which can take a bit of doing) blew her mind in terms of back health goodness, which served as a pretty big recommendation for me.  She also recommends yoga balls as well.  I'll have to ask her about armchairs :)Talking to your local chiropractor or ergonomics person is probably a good plan if you're going to be buying any furniture you plan to use intensively.