I would rather use 3.5, but I'm open to using some of the unearthed arcana stuff. I like that armor as DR stuff, but it only works in a world where we're not optimizing lancers and shock troopers. The vitality/wound stuff looks interesting, but it does make a PC more frail and wary of combat. Once again, as long as you're not tossing around power attacking crit masters, it's ok. I like how fortification suddenly becomes important though.