Green Office Chairs

Is your desk chair good for your back? Is it recyclable at the end of it's life? Is it made from Recycled components?
Anyone spending day in, day out sat at a desk or workstation knows the importance of something good to sit on. For years I've sat on mid-range chairs for 40 hours a week and had to replace chairs every 12-18months. Not only that, but mostly, despite their ergonomic claims, most haven't been fantastically comfortable either. This resulted in time away from desk, stretching, stimulating blood circulation in my legs, and I'm sure on a number of occasions they have been the cause of a trip to the Osteopath.
On my last trip to the Osteo we started discussing my office chairs and how fast I seemed to get through them. It seemed I wasn't alone in finding mid-range desk chairs to be quite disposable as well as uncomfortable for long periods of sitting. I was then persuaded to look at spending a bit more on my next chair with promises of it lasting upto 10years as well as being almost perfectly ergonomic and supportive of good posture.
I walked away with a number of recommendations and the intention of doing a little research into which was going to be the best for me as well as the environment, as I want to try and offset the number of chairs I've previously sent to landfill at the end of their lives!