Has Anyone Switched!!

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I just bought both 30DS and Ripped in 30. Has anyone used both intertwined? I just finished 30DS L1D10. Thought about switching it up and doing the first week of Ripped, then L2 of Shred, then W2 of Ripped, etc etc. has this been done with fantabulous results or is it best to complete one DVD then move on to the next one?