I'm a skeptic about this stuff, but having said that I do have info you may be interested in.
My brother had major back surgery and was laid up for a very long time and taking lots of meds and pain kilers. He had done 6 shots a day for a month and hasn't taken meds since. He has a friend with joint pain so bad that he was taking a handful of pills a day. He hasn't had to take 1 pill since taking this stuff. Now my brother is a salesman and has tried to involve our family in many of these. He is also doing it for the money too, but on the other hand, before his surgery he was a very fit man, always working out and very active. He since has gotten my mom and 2 sisters under him. My mom has bad artherits and a bad left knee my one sister is pretty healthy but my other sister has high blood pressure and allergies. My mom isn't very fit and my other sister drinks a lot. Both not very healthy life styles.
I'm pretty healthy and fit and have no use for this. I also do liver/colon cleanse and try to eat healthy. There is no point for me to use it.
My thought is that I feel juicing is very healthy but too juicing benefits are usually within the forst 20 min of the fresh juice. Once preservatives are added it kills a lot of medicinal benefits. That's not to say this stuff doesn't work. But imagine how much better it would be if you juiced you own. It would be much less in price. I think if you look at it that way you may understand the skeptics, but my feeling is even if it's mind over body and you are psyching yourself out who cares if you feel good, after all isn't that what this is all about.
Personally it's not for me and most people on this site are about self help not promoting pyrmid schemes. My advice spend you money on a juice machine and cure more than the mangosteen can. Hope this helps you in your decision, take care!