I've seen pics and videos of people doing the full suspension. Even so, seeing those close up shots of the heathooks in those pictures (with the redness probably meaning infections) still grossed me out. Coincedentally, I rewatched Even Horizon last week. Remember that scene where Doctor Wier goes insane after clawing his own eyes out, and they find the corpse of someone they killed suspended with meathooks, with his torso skin held open with more hooks and all of his internal organs removed? Yeah, I needed that image put in my mind again. (it doesn't gross me out when watching the movie, but, y'know, it's obviously a mental picture I get when live people willingly do this in real life, minus the organ removal*)
*Of course, I'm sure there are people out there working on doing the organ removal in a safe fashion, that leaves them alive. More power to them/Good luck with that/Not that there's anything wrong with that/Freaks