I use Isagenix. *spare all the haters*
I can't say anything about the full cleanse program. I don't use it that way.
I use the shakes or bars as meal replacements, and am a fan of a few other products as well. I work on the go and spend a lot of my day in and out of restaurants & driving in the car all day. Sometimes, a meal replacement is just what I need in sake of time to get the fuel I need. I like the Isagenix bars in particular because they keep me full and satisfied. And they're whey protein as opposed to several over the counter bars that use soy protein