I use Finaflex 550 and LOVE it. Get's you shredded. Cuts fat down and keeps gains. PROS: Surpressed my appetite (during tough diet cuts), boosted my energy, cut down belly fat, and gives you focus! Cons: You sweat a LOT (wear a lot of deoderant) and you feel like you are on cocaine. Out of the 6-7 fat burners I've used including Lipo Black 6, I REALLY like Finaflex.