Master Cleanse?

Hi Everyone.

I was just wondering if anyone has tried or known someone who had tried this lemon, maple syrup, cleanse thing. Here is some general info about it. http://themastercleanse.org/

Anyways a couple of my roommates just started it and are doing it because it's supposed to allow you to drop 1-2 lbs a day on it (and it's a 10 day cleanse). I opted out but am having 2nd thoughts. I do not want to admit this and feel horrible for feeling this way but I feel like I've been working my *kitten* off for 6 months now to lose 25 lbs yet in 10 days of nothing they could lose close to that. I don't know... it's just discouraging in a way. I wish them the best of luck and hope they see results but I wanted to ask around and do more research before jumping into something like this. Lemme know your thoughts/experiences. Thanks