Just to give an update, I am doing P90X now and things are going very well! I plan to blog each week as I go through P90x from start to finish. Power 90 did an amazing job of getting me ready for the X!
Just to backup a step, I lost over 25lbs with Power 90. I used Shakeology just after I finished up the first month. I've stayed with Shakeology everyday since. For P90X, I am doing the "Classic" version and I am following the diet plan to a "T". I am doing the "portion plan" for my diet, it seems really straight forward.
I'm just like everyone else, the pullups seem to be the hardest thing for me. I enjoy doing the arms and tricep exercises the most. The YogaX is tough and will also really challenge you but, I like doing the Yoga now after getting familiar with it in Power 90. I am not very flexible so the Yoga has really helped me in that regard.
If you have any questions, drop me a note, I am always happy to share my experience and I love to hear about yours!