Yes, I did attempt Betalife. I was unsuccessful at it, however I think it would work a treat for some people, and that could be you so have a go!!
I found that in the first few weeks, I went to the toilet (yep, number 2s) alot, up to 5 or 6 times a day, but that did settle down after a while. All that raw food... it like WOW.... your system gets a clean out. I also got ALOT of wind, and was constantly farting. (quite embarrassing and uncontrolable at times!!).
The DVDS were brilliant, that little song sticks in your head, and it's really exciting when you start.
The DVDs however are VERY long, and you need to set aside several hours to fill in your work books and listen to the DVDS. The information they give is just brilliant, and you will learn alot if you don't know much about health and nutrition.
I lost about 5kgs, before giving up and putting it all back on. I paid $300 for my program, and sold it on Ebay for $60. I am STILL paying it off, and will for the next 6 months or more. They charge you to use their forum too, which just sucked when you pay that much money for a program, a total rip off.
I think that Betalife is designed for people who are eating really badly (lots of starches, highly refined and processed foods), and not doing any form of excercise. The program really is designed for BIG people (I am 30kgs overweight). But, if you eat a relatively good diet, and excercise frequently, and only need to lose a few kgs, I'm not sure it would be worth it.
It seems that many, many people succeed on it, however the girl I did it with stuck to it religiously and lost no weight, and I lost 5kgs then put it all back on.
See how you go. You can only try, what have you got to lose??