It works, and it is probably better than a 36 oz Red Bull. It has less caffeine and some vitamin B.
Best solution to your problem: pull over and take a 20 minute nap. That almost always results in me being fully awake for another 60-90 minutes of driving, and I can just repeat as needed.
I use this product when I am desperate. For instance, if I am on a long road trip and I'm falling asleep. I would rather drink a few ounces of chemical-shit-storm rather than fall asleep at the wheel. In comparing 5-hour-energy with similar products, I found the carbs on this one to be negligible. Yes, I know they are all terrible, but this is the least of the terrible for me.
I've never had this product but if you are on the road and have a long drive ahead of you and are sleepy then you better pull your ass over and take a nap. Lol. Save a life.
If you are still tired then something like this may do the trick. If it will keep you awake then I say go for it. Or, simply snacking on something like salted pistachios might do the trick too. Wouldn't salt help a bit?