Starting week 9 of Power 90 Master series today. Power 90 Master series is a great transition from Power 90 to P90x so far.
Why Power 90 Master series? Due to lack of some equipment, space, and time I ended up doing Power 90 for too long. I got comfortable with leve 3-4. Even after losing 45 lbs. and in overall better shape I felt I was still not up to P90X without modifying more than I care to.
After the first week or two of doing Power 90 Master series learning the different routines I felt more confident on working on my form and increasing intensity.