More for caffeine fans?
For me personally, they do nothing. I'm not really affected by caffeine and I have a very high metabolism so I'm always needing substance in addition to energy. The people I know that like these "shots" use them for exactly that, a shot of energy during a meeting rather than resorting to a cup of coffee. I will say I think the mocha tastes pretty good, that's the only kind I've tried. The goo is sort of thick (slightly less viscous than Elmers Glue), but I didn't expect anything different.