Surge Workout Fuel isn't a caffeine-loaded stimulant, NO2 supplement, or anything like those. It's essentially a combo of the right carbs and extras (like beta-alanine, citrulline malate, and an electrolyte mix) for sustained performance. Basically, after 45 minutes of hard lifting, I feel as fresh as I did after the first 5 minutes.
I'll usually have a serving 10-15 minutes before the gym and a serving during my training (with MAG-10). If I'm having a crappy, slow-moving day, I might have a Spike Shooter with the pre-workout shake for an actual energy boost.