I've got the long one, with two legs. I'm 6'3" and close to that weight limit too, and the sides definitely bend in noticeably when I'm sitting on it. Less so when I'm laying down on it. I asked the maker about it, and they said it's plenty strong, so I'm just going with it rather than paying to ship it back. If I had it to do over again, I'd probably go with the three leg version.