Lurker here.... Just wanted to say that I pre-ordered all four of these when I first heard about them, and have (so far) done the cardio one three or four times, the weight one twice, and the yoga one once. (The hour-ish long workouts on each, haven't tried the shorter ones yet.) I haven't tried Bob's Workout yet - mostly just because I've been too busy with Turbo Fire since it got here!!
The workouts, IMO, are awesome!!! The only issue I have with them - and many over at VF have said the same thing - is that a couple of the background exercisers moan and groan a lot, and are really annoying. However, if you're really working your butt off and giving it your all, you don't notice it too much. They make Jillian's workouts seem like a walk in the park - IF you're giving it your all and going heavy enough with your weights.
I definitely feel it was worth the $40-ish spent.