I use this before and during all of my long runs. I can't stand to eat breakfast before a run but the Chocolate gu sits well with me. What a great excuse to eat chocolate :) Its small and compact so it carries well and it tastes awesome! I've tried many other brands and the flavors are difficult to stomach.
Nice to see that Mt. Gear offers Gu in a variety pack this way you dont get bored with one particular flavor and you have a choice of, no caffine, caffine added or 2x caffine. This way I can decide which one to use according to the activity and time of the day..