My husband loaned me his aeron chair and oh my gosh this makes such a difference for my back. I need to get one asap. Sitting at my desk has basically been agonizing for me for the past year, which contributed significantly to my lack of productivity.
I've definitely seen them on Craigslist. I like more cushion and fabric on my chairs and the Leap has that. Also am a fan of their adjustable arms. They not only move up and down, but also backward, forwards and can be pushed in for us smaller framed people.