I have been doing yoga for 22 years. I am not a purist, however, and was open to a variation on the practice. Jillian's Yoga Meltdown is a departure from the practice of yoga. If you are after or used to true yoga (and precious about it!), you may feel frustrated by this workout. If you are familiar with yoga (intermediate level) and open to a variation in style and mode - more cardio, more reps - you will like this DVD. I like it very much. I find that, after a couple weeks, it has become less challenging for me and not as challenging as my own yoga practice, so I turn to it less frequently now. I generally choose it when I'm looking for a change of pace.
There are 2 x 30 minute workouts - Level 1 and Level 2. I found little difference in challenge between the two, actually, and do both back-to-back, despite the cool down and warm up twice over. Jillian instructs with 2 women behind her, one offering a more advanced version of what she is doing, the other offering a beginner level version of the moves - this is smart and helpful, particularly for beginners - my guess is that many buyers of this video are new to yoga so following the beginner approach, initially, is prudent.
I have two of Jillian's DVDs (the other is No More Trouble Zones, which is fantastic). I don't think this is her strongest effort but I think it's a worthwhile DVD to own, especially if you are looking to broaden your exercise routine and curious about yoga but wanting a ramped up version of it - which may seem counter-intuitive for yogis but is valuable for those used to strength training and cardio and wanting a twist. If you are intermediate level in yoga, you will get a good workout. Also, if you prefer shorter workouts, this works nicely. If you want to do both back-to-back for added intensity, even better.