They have a strong bitter caffeine aftertaste that lasts about 20 minutes after the initial 3 minutes of sweetness. I usually keep chewing it because as long as its bitter, I know it still contains caffeine. Aside from tasting bad, Mad Croc has a pretty good caffeine/$$$ ratio compared to non-coffee beverages (I can't drink coffee). Being a caffeine addict an a non-coffee drinker is a complicated situation these days since I stopped drinking soda a couple months ago.