I would highly recommend it.

I borrowed the discs and bought the chin up/pull up bar from the P90X website.
I should thank dancerjack. I had only tried a few of the routines over several weeks, but didn't really get going 'til I saw his profile.
I'm just finishing week 3 and I've only missed one of the 20 days so far (went to the gym instead.)
This is intense. I would work into it if you are not totally in-shape. Some days I feel like I just can't do another rep or set, but I've powered through.
This takes a bit of motivation and perseverance.
Trust me, you will not only see measurable results in just days -- but you'll feel 'em everywhere. G