I am currently doing Celebrityslim too. I have used these shakes aswell as Optislim, Tony Ferguson & Kate Morgan before, basically I just tried them all out to see which one I liked. I stuck with CS mainly because I can get them at my local Priceline & I liked the flavours.
I lost weight about 2 years ago on these shakes, about 8 kgs in 6 weeks, but I also did some moderate exercise too. My elliptical bike (cross-trainer) I used about 4 times per week but for only about 20 mins at a time. But those 20mins were intervals of moderate/fast pace, which really gets your metabolism firing!
When I first started off I struggled to do 5mins! But soon I was "jogging" on it & eventually managed to do 6.5kms in 20 mins!
You've made the right step & I know that people say that you just put it all back on when you go back to eating "normal" food, but really, it wouldn't matter what program you were following, you'd still put it on again it you went back to eating "normally" again. If "normal" was having bad eating habits & what got us here in the first place!
I went back to eating 'crap' food & not exercising, thats what made me put it all back on again, just plain laziness! So, in a nutshell, if you stick to it, it will
work. These 'shake' programs often have a maintenance plan to follow after you've reached goal weight too.
Good luck with your journey hun!