Red, white and BOOM definetly has the stim junkie in mind. Being very high tolerant to caffeine myself, this pre-workout gave me a kick not many other do. Energy and focus and the driving force behind it. With 400mg of caffeine, it is not for everyone. My reasoning to only 4 stars, is it did cause me to crash. I work to jobs, with my workout being between the two. I had a busy schedule and most days a pre-workout is almost neccassary for me to give that edge in the gym. This did the trick, but was sluggish after the workout was completed.