P90x and Insanity?

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Any one ever do p90x and Insanity at the same time? Im doing p90x and my normal gym routine. I found a topic in a forum with people saying they get quick and faster results
http://dailyburn.com/forums/fitness_and_exercise/topics/anybody_else_combing_p90x_and_insanity
I know it seems crazy, but I like the challenge. Any suggestions or feedback?