This is just a personal preference, but Shiva Rea is annoyingly spacey, telling you to "egggzale and inhale." There's too much talking and not enough doing.
Unlike some reviewers,I didn't mind the fact that the tape uses voice-over, but i found the instructor to be a little too "relaxed" for my taste --that is, she doesn't convey enough energy to get me going. I was a regular exerciser before I got pregnant (pilates and running) and so, I found this tape to not really be enough. If you have time to exercise 2 hours a day, you might combine it with a brisk walk or light run to get a more satisfying workout. But, if you're like me, an hour max is all you can spare. Actually, I haven't touched this tape since getting Leisa Hart's "FitMama". The latter includes yoga along with some fun salsa-dance aerobics, as well as kegels and stretching--it just feels like a more complete, efficient workout.