I'm getting on with it well. On to Level 2 now which is so far quite a lot harder than Level 1. Not sure if it's because I'm not used to it yet but some of the moves (variations on the plank position especially) seem a lot more advanced.
I've really struggled to do the dvd everyday though and reckon I've been managing about 4 times a week. I've decided not to feel guilty or be down on myself about this as it's always important to reward your body with rest days and 4 times a week is definitely a longer term, more sustainable option for me.
natlou79 - I'm not sure whether or not it is strictly recommended under Dukan. Although it only lasts around 20 minutes, it is fairly intense so I would personally steer clear for the first couple of weeks of starting whilst your body gets used to the diet. After that though, I don't see any reason why you can't go for it.