I did the p90x for a while and it's very effective. Insanity appealed to me because you don't have to use any equipment but after seeing peoples results on youtube I decided against it. I personally wouldn't want to get that skinny. Plus, those workouts put far too much stress on your knee joints.
I too have heard that Insanity is hard on your knees but I've never tried it myself. I do know some people who have done it and they lost quite a bit of weight.
The BeachBody workout that I am most curious about is Les Mills Pump. It comes with a barbell and some plates.
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