I used Perpetuem(tm) one year. It uses longer-chain carbos, notably maltodexatrin, so it provides a more even supply of energy and no sugar spikes or crashes. I used it on a 100-mile road race, and never felt hungry before or immediately after the ride. Trouble is, after a while it starts tasting like barf! I'd use it on another 100-mile ride, or maybe Heed(tm), but not for normal rides.