I'm in the second block on P90X3.
If you've done P90X, you'll be surprised at just how different P90X3 is. But it's an effective program that focuses on strength, agility, speed and flexibility- often all in the same workout. Expect a lot of influence from yoga and pilates. For example, in one of the strength videos, you'll be doing bicep curls...on one leg, then you will lean forward into Warrior 3 and do a fly. They pack a lot of work into each 30 minute workout.
"A mistake is not failure but feedback. -Rod Gilbert"