Been doing it for a week and 3 days now and it's great! It does bugger me up (because I'm so unfit, never done any exercise in my life to speak of ) but it really is getting me motivated and making me feel much better. Time will tell if it helps me lose weight but something HAS to be shifting because I really am working so hard
It takes about half an hour the first time you do it to put all your info in (age, weight, measurements from everywhere, resting pulse, pulse after 2 minute exercise, can't remember the rest!) but once you've done that it gives you a personalised workout according to what you put in. It really is just like being at a very good exercise class, you simply follow the person on the screen and do what she does
I got mine of an eBay shop for £13.95