I've been doing the DVDs for a few weeks now and I love them. I prefer the classes since they seem to be a little different and more upbeat because of the energy in them, but the DVDs are pretty great. If you don't like dancing, then they probably aren't for you.
It does come with a "basics" that breaks down the moves step-by-step. It was too slow for me so I just jumped right in and I learn as I go. I'm pretty sure I look like an idiot, but I have fun. I wear my heart rate monitor and I burn almost as many calories doing the Cardio Party as I did when I was going Insanity, but I have more fun.
As far as results, I've noticed some tone and some inches have come off. I do strength training and HIIT, and then do Zumba as well. To me, it was worth the money.