It does work, you just have to be patient. You will probably find your weight will fluctuate or plateau from time to time as well but don't give up.
It is not a miracle diet, you have to be strict until you get down to your desired weight but how quickly you loose really depends on what you ate before and how diligent you are now.
I lost 17 kilos in a year and have another 10 to go but am going through a bad patch in my life at the moment and have put a kilo back on as I was eating too many of the yummy, although approved, sweet things.
Need to feel better about myself to be stricter and it will come.
Good luck