It's not as good as the original Craze, but Craze v2 is my preworkout of choice.
It gives just enough amp to get you going but doesn't give you a huge amp/crash like others that are loaded with caffeine.
It has a very interesting focus component that messes with your brain in a great way. Hard to explain this other than to say it's heavy on the focus.
I think the best quality of Craze v2 is lasting endurance. I can really push myself for hours and never die. This is a great product for people who like to put in the time for long, brutal workouts.