I buy what's on sale ! When I first started using goos, I tried a Gu pack, don't recall the flavor, for a grady, 16 mile, headwind return portion of an out and back - it made a world of difference!! A week later, same ride, tried Clif Shot, not nearly the same effect. Friends of mine who mtb 50-60 miles at a time on a regular basis rave about Enervit/Enervitene products. They have vitamin B3, which helps with the uptake of the carbs. I tried the cola flavored Enervit - it was really acidic, burned my throat, and tasted like hot Coca-Cola. Bleh. I don't know that I saw any greater results with Enervit than I do with Gu, and the cola flavor was really hard to gack down. The lemon-lime is also acidic, but not as bad.

I think the chocolate Gu tastes like brownie batter. Brownie batter is not something I eat IRL, but halfway through a 60 miler, a choclate goo goes down pretty easy. I have the metabolism of a sparrow when I exercise, so I always make sure to have goo on rides of over an hour and suck them down before I need them.