I know all of this is very subjective, but I always stayed away from sports drinks. They just seem to make me gag. But a couple of years ago I picked up some gels to ward of the bonk, and for me, they work extraordinarily well. I actually can feel them taking effect within a few minutes. You've got to wash them down with a goodish amount of water. I find I use maybe two on a very hilly 50-mile ride and always carry some extras (Good to have extras for a bonking cycling buddy).
Anyone else have experience with this--and which ones do you like?