It's just hard workouts. Nothing magical.
The same guy also is selling the "Ten Minute Workout" which he claims will give you amazing results with only ten minutes per day. So if you want to trust a guy like that, go ahead.
http://www.beachbody.com/product/fit...ute_trainer.do
Most high level trainers who work with elite athletes have been doing p-90 style workouts, but correctly, for years. You can read up on them pretty easily.
If you're already doing hard MMA style workouts, I doubt it will help much other than give you a change of pace. If all you do is lift weights the same you've been doing for years and run a little bit here and there, then it will probably yield decent results.
Depends what you already do with your workouts.