I'm not a hammock dweller myself, but clearly see the practicality. (Like TarpTents, just because I don't choose them for myself doesn't mean I don't think they're a good idea.)

However, reading another thread here, about ropes breaking, makes me think that the ground underneath DOES matter. I realize there's not much risk, if you use proper lines, but I'm thinking that if a line does break, and you fall, those rocks, branches, or sticker bushes might suddenly become very important.

With no practical experience in the matter, I may be totally off base, but it makes me wonder.