Honestly? It's different for different people. Some people feel NOTHING and see nothing. Some say they feel an appetite suppressant reaction, others say they lose weight. I'm told others feel nauseated, stressed, shaky, and ill. My personal opinion (from experience) don't take the pills. It's not worth it, it's pricey, they are short fixes and may not even be fixes. People have died taking some of the pills people have recommended, people have had liver issues, kidney issues. Just... why risk your health on a possible few extra pounds quickly when when you do it by diet and exercise and it's more sustainable and can be done correctly?
I did try it, because I've been desperate before. I will no longer ever turn to pills that I see in the media. I've had bad reactions to them, and when the scale didn't move for this particular pill, I realized I just wasted a ton of money for a giant placebo. I'm happier doing it on my own, and the numbers fall off at the same rate.
Not only that, but supplements are not regulated like normal drugs. You may purchase a bottle and not even get the main ingredient in the bottle. The labels are often wrongfully printed.
https://www.youtube.com/watch?v=WA0wKeokWUU#t=631
Just my opinion.