Lipo-shred stack is my favorite. I have tried dozens of OTC fat burner/energy/ appetite suppressants in the past but this combines them all. I was energized but, not shaky or "stimmed up". I was loosing 2lbs/wk while running this combo. I was able to stay strong during my workouts. It is almost too effective as an appetite suppressant! I had to force feed many times. Lipo stim and Lipo flame are great products alone, but when stacked they are my favorite and most effective combo.
I personally am just a fan of an ECA stack.. nothing has given me better energy than that