I've owned this one for awhile, along with the 30 day shred. Initially, I hated it - mostly because it was too hard for me. I was sweating so hard & could not complete most of the moves. While this fuels some people into trying harder, it made me put it on a shelf & not look at it for several months
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So, I focused on the 30 day shred, and just pulled out NMTZ about a month ago. I LOVE it. It is one of my favorite strength training DVDs & for me, a really great total body workout. It is different from the 30 day shred, though, in that it is primarily a strength training/toning routine - no real cardio after the warm up.
I incorporate this 2x/week - my other days I make sure to include more cardio (or primarily cardio).