I love the original IMAX, it's straightforward, athletic rather than dancy, excellent cuing, the intervals don't seem as exhausting as the later ones, and it does seem to build in intensity so you have a good long warmup period. To me it's a classic. To me, IMAX2 is also a good workout and well cued, but I don't LOVE IT LOVE IT the way most do. And I have several problems with IMAX3 - on the very first combo, it's a not-well-cued facing-backward-to-the-step combo that's frustrating, and the first interval is a KILLER KILLER, and then Cathe says the intervals will just get harder and harder. Even though I think the first interval is harder than almost any of the others, and the others will be easier, and even though I now know the first step combo after having done the dvd several times, I STILL can't overcome those two sort of "psychological" problems - I just sort of feel like a failure right from the start of IMAX3 - I can't get the steps and I can barely struggle through the first "easiest" interval. BUT with IMAX and IMAX2 I feel more empowered and accomplished :~)