I have used Ripped Fuel, Diet Fuel, Hydroxy Cuts, Thermal Cuts, and Xenadrine w/ and w/o Ephedra...all with similarly weak results...the only thing thaty really seems to work effectively is diet and cardio...just payed way to much for a bottle of Clenbutrx...it is the only one of all of the ones that I have tried that seems to be at all different...hopefully it will make a REAL difference...