There have been some good reviews on Lipo 6, but I am yet to try it. It depends on what kind of fat loss product you are after.
For stims, I liked AMP and am using Leviathan now - both are great pre workout.
Also check into non-stim fatburners, which you can take any time, including later during the day without affecting sleep. They are effective on their own, and/or can be used in conjunction with a stim for enhanced results.
DCP worked well for me, some have also experienced greater endurance in the gym on it, as well as some major appetite suppression.
Also look into sesamin/thin.. thyrotabs is another good fat burner. Just some choices to think about!