I just started the program on Monday. Lost 6 lbs in the first two days. I really feel fine, I was expecting to have some caffeine withdraw headaches but I don't. I started at 237 and I hope to loose about 100 lbs. I'm a really picky eater and was worried that I would have a hard time downing these shakes... They're not delicious, but not that bad. So far I've tried the chocolate with a teaspoon of sugar free chocolate pudding and vanilla with a teaspoon of sugar free cheesecake pudding, the chocolate was pretty good and the cheesecake was just ok. I got some lemon pudding I'm gonna try today, I'll let you know. Sugar free jello is actually pretty good! I also really like the mio water flavor. For exercise right now I'm tackling my spring cleaning list then I plan to walk with my brother who lost 200 lbs on this diet. The only negative I can think of right now is having to use the bathroom constantly.