Friend has the Monarch. Its neat, little too expensive though. Light and packs small, however does bad in soft ground (loose gravel/rocks, mud) since all the weight is pretty much on 2 little ball-points. And yes getting out of them requires an art.

I just use a REI 3 legged stool whenever I feel the need for a seperate chair (i hammock). http://www.rei.com/product/765283