Observing your body and changing positions whenever they become uncomfortable is far better for your long-term health than is a well-engineered chair.

I now rotate between a standing desk, a normal desk, a couch (only when reading/exploring - typing here is tougher), and the floor, and all of my back problems have disappeared.

To each his own, I suppose. I've been deskless for 4 years, mostly on a couch in a relaxed position with laptop on my, hmm, laps. It's much more comfortable for me than chairs and desks. I sometimes spend 16 hours per day pressing those keys; I don't think I could've survived that in a chair behind a desk.

I'd wager that it's more healthy than most home offices, which tend to restrict you to one position.