Not doing P90X, but am now 15 days into Insanity by the same guys, though thankfully less of a dickwad than the P90 guy who comes on at the end of some the Insanity sessions.
I'd say if he pisses you off from a trailer, he's not going to movitate you during a session.
Started it for general conditioning; cardio, toning, core and agonistics and all seems to be going well. Also the fact it's 30-60 mins means it's pretty easy to slot in to an evening. Plus you don't need any equipment.