Its like anything. Do your research, read, educate yourself. It is not an overnight thing. Like bodybuilding, it takes time and I would guess most do it wrong, give up, and then say it doesnt work. The truth is, it will take a lot of time over a period of time. Just like working out. So, how bad do you want it?
There are enough testatmonials that say it works. I could tell you it worked for me, but in the end, it only matters what you believe and are willing to do. Read as many related threads here, take it slow, get on a plan, and give a good 6 months at least. Then you decide for yourself.
If it doesnt work, add yourself to the list of people who say it doesnt work. I am on the list of people who say it does work. But dont take my word for it.