Just to follow up - we ordered the butterfly chair and got it today. Unfortunately, we're going to be taking it back. However, it's not a bad product. I'm lazy, so I'm cut-and-pasting the review I left for it:

It's not what we were looking for. Essentially, it functions the same as a 4 leg chair, but your own two legs are numbers 3 and 4. If you have knee issues, this is not the chair for you. However, with that said, it's not uncomfortable, packs up small, and is fairly light. A good compromise for backpacking and it gets you off the ground, but you're giving up the ability to lean back and relax. It's a clever idea, though, and was quite sturdy.


So, for those who don't mind being the front leg support, it's a pretty good little chair, and it was quite supportive.

On the other hand, we did get the Big Agnes mattress and the memory foam pad. We're going camping next week, so we'll find out if it works for him. smile