Meh.
I was slightly disappointed. Everything was a bit convenient - especially the interrupted talking. (trying not to give anything away).
The flashbacks were good, one in particular but I think you'll know which one.
I can't understand how people fainted or walked out of this, there wasn't anything in this film that made me or Siouxsie squeamish. Maybe we're hardened after years of watching horrors though.
It's no worse than Event Horizon, Saw I and II or even Hellraiser.
Saying that, a couple walked out about 10 mins after the chains guy (they walked during the story part in a bedroom). Another woman walked out a while later (possibly after the first person that was involved after the guy got out of the crate - jeezuz, trying not to give anything away is difficult!).
I would actually say that Saw II was better than III.
@Karlos, you'd be a bit of a plonker if you watched Saw III first. You'd be better to see them from the start.