I've done Advocare twice. Both times I lost about 15lbs in the 10 day period. And the. About 20-25lbs within the first 24 days.
The problem is, it's a lot of water weight and you will gain of all back of your not disciplined.
IMO, diets are all about lifestyle change. If you eat Jims Steak Out 5 days a week then the cleanse and advocare itself will work based in the fact that your not eating like crap all the time. But get where you want to be and then maintain as you eat crap a day or three a week and then more healthy the rest of the time and you'll be ok.
My cleanse this past time went well. Still dieting without following Advocares plan. Everything else has been the same except I'm not using their products (the fibre and the pills). But a supplement shake for breakfast (I use Visalus, because it's the shake that tastes like a cake), 10 baby carrots and 16 almonds for a snack about 2-3 hours later, chicken salad for lunch, more carrots and almonds another 2-3 hours later, then chicken breast and asparagus for dinner. Drink a ton of water all day. Devide your weight by 2 and drink that many ounces a day in water.
My biggest bane is soda. If I'm not dieting I'm drinking like a 2 liter a day. Just can't help it. But when I'm dieting I'm chugging flavored seltzer water for that flavor and carbonation. I'll have about 1-2 cans a day. Usually after lunch and dinner for a treat.
Good luck with it. It will work, as long as you keep disciplined after its all done. But that can be said with any diet.