I bought a medium XTherm last summer and have been using it in warm and cold weather. I am 6' 1" and the medium is only 66" long, but it works for me since I am a scrunched up side sleeper. If I lay on it on flat on my back, my feet hang off the end, but I can't sleep in that position. Well I could, but then I would sound like a bull Elephant in heat.
I tried the stuff sack pump that came with it, but after 20 minutes of torture, I yelled pinche cabron and threw it against the wall where it slid into ignominious defeat behind the couch. I suppose it is still there.
Then I obtained an Instaflator, which was cheap and worked fine. Next I saw a comment from Ray Estrella touting the Microburst, and I thought, hmm not much heavier than the Instaflator, but totally decadent, just set it and forget it and if it's good enough for Ray, it's good enough for me. So I got one of those, it works fine, and I have been using it ever since, although some of my backpacking buddies ridicule me for being decadent, then they ask to borrow it.