The only thing I don't like about P90X is the fact that it emphasizes high reps of light weights (more of a conditioning workout) vs 4-6 range reps of heavy weights (which helps increase overall strength).
In my opinion, bulking on workouts with high reps (20+) and low weight is slightly more difficult. I feel like bulking is the time where you also put on a load of strength (putting on weight, working with low reps heavy weight), since when you're cutting there's a bit of difficulty maintaining strength.
I've also never heard of someone bulking at 3500 calories over maintenance. I'm pretty sure that bulking at a surplus of 1600 calories will already lead to a high amount of fat gains.
Edited by SN54, 04 August 2010 - 07:22 AM.