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I'm 6'3" or so, and about 200 lbs, and this fit me very snugly. Not too snug, but it definitely hugged my torso and arms just like a thin wetsuit would do.
Getting it on and off takes a second -- it's a bit tough to do alone when it's wet and you are trying to roll it off your torso, but can be done with a small bit of effort.
Brushed up against some rocks while diving, which tore a small hole into it on the first day using it (of course). Have washed it a few times since then, and the hole seems to stay the same size, so that's a plus.
If I had to buy again, I'd probably get a size up for using it on land, although the way it is is fine for diving/snorkeling, otherwise you'll have to deal with drag.
I bought a medium-short sleeve and love it! However the long sleeve Medium is tight around the neck and upper chest, the sleeves are ridiculously tight, I have thought about cutting an inch or so off the collar, and cutting vee in the neck, and maybe cutting off the sleeves, in order to get some use out of it. I am not going to pay $20 in shipping charges to go up a size - a waste of money!!!!