I have got the insanity series, but havent dove into it seriously yet. I was pushing 22 stone, but at almost 6 foot 5 I wasnt a wobble slob, most of it was from the gym but I wanted to slim down a little before trying it properly. I bought some Oxylean fat burner pills and a big bag of Phd Diet Whey and dropped 2 stone in around 5 weeks, once I felt comfortable enough to try insanity I did the plyometric cardio circuit, number 2 and then tried the insane abs one, number 12 and found it to be great, its hard work and you get a proper sweat on!! You hurt, but in a good way.....I cant wait to start hitting it hard, got some friends who used it and they are showing good results too!