I'm using SX, and it is great for mood/app suppression/energy, not been on in long enough to comment on the fat loss.
And like he said, diet is a MASSIVE part of losing the weight. After that is in check, your weight training is the other big part of fat loss/muscle building. After those 2 are in check, and only then, are the supps really going to come in and give an extra punch. Otherwise, you are just going to waste money and time on them
SO:
Diet in check first
Training in check
Supplements come into play(can, not at all required)
For a kickstart, just look at old pics, and/or make some smallish goals for yourself. Like, 1 inch in the waste, then 3, then etc... Or, fitting into x pants loosely, then x pants tight, then those same x pants loose, etc...