I've read the first few chapters from a preview copy I was given, and I absolutely love it. I keep meaning to get around to buying it; from what I remember it's got a feeling very like some of the humourous bits of Catch-22 or certain Vonnegut pieces.
I read it. It was fun. The author has a way of presenting his subjects that walks the line between mocking and credulity. It's clear Ronson thinks these guys are mostly nuts, but he interviews and describes them in such a way that you can see the real people-ness underneath. Sure, staring at a goat with the intent to burst its heart is whacked, but once you learn that these are army guys testing out an idea you gain some insight into the situation.
I read it as well. I have poor retention of things I read in general, but I recall enjoying it quite a bit. The author seemed somewhere between investigative reporter and a kook himself, so I would take it with a grain of salt, unless you've got your tinfoil hat at hand.