Bump
P90x works for me, I had to modify the program though. I took out plyo, yoga, and kempo, as they don't really seem to be neccessary. Instead, I do chest and back, arms and shoulders, legs and back twice a week, and of course switch them with each phase. I don't think you'll have to worry about the overworking of your body with this program if you do it right. Tony seems to stress that you should do 8-10 reps for size or 12-15 for lean. The problem is, if your like me and trying to get bulk, 8-10 isn't enough for the weight that I'm comfortable with. If I go a weight higher, I risk hurting myself (tennis elbow) and quit the program. So, instead of picking the heaviest weight I can do and do 8-10 reps, I pick the weight I'm comfortable with and do max reps, forget 12-15. You might have to push pause to get your reps done, but this is the safer way to do it.
Also, I noticed that I wasn't getting anything out of pull-ups. That was because it wasn't working my back out correctly. So I went to resistance bands. The move is so much easier, which was why I was suprised that I was actually seeing better results than with the pull-up bar.