Mint Chocolate is my absolute favorite, along with Vanilla Bean. And, now they offer peanut butter??? Yum. Some athletes complain about the "pudding-like" consistency. But, I don't mind it ... especially when I'm on the run. I carry 2-3 in my handheld water bottle and pull them out ever 40-60 minutes, as needed. I don't even need to stop to tear open the packet and consume it. I tend to "sip" on one over a mile or so and then toss it in the trash (don't litter!) or fold it back up into my handheld water bottle. I always down my gels with plenty of water. They key to consume these, is taking them BEFORE you feel like you need it. I love so many of the flavors, but tend to stay away from the berry flavors ... just my preference.
My boyfriend tried two for the first time yesterday and really liked the boost they gave him. It was one of his longest runs ever (12 miles) and they really helped him keep going and I noticed his pace increased during the miles immediately following consumption.
Gu Performance Energy Sampler