Well, since it was a preorder and so inexpensive, I don't really regret it. I really like Imax Extreme, the Gauntlet is ok, but not too useful for me and I don't like the Viper. The Viper has tough Imax2 intervals, then I end up getting cold and clammy doing the upper body stuff and totally catching my breath, so I don't like it. I alternate between interval cardio and long cold clammy stretches. I don't feel like anything gets worked out well even though it is so long.
Gauntlet is a good workout if I skip all the upper body so my heart rate stays high.
Imax Extreme is a nice long tough workout which I plan to use for a long time.
So, I'd say I'm "ok" with it, but I wouldn't have wanted to pay full retail for it, wheras the other 3 DVDs are well worth it.