First 15-20 minutes (2 caps to assess tolerance) I felt a "rush/tingly type feeling. Began to feel immediately energized. I've been wide awake and doing shit ever since. I've been fighting off going to the gym because I've had a whole bunch of shit to do beforehand. Now that its done, I'm off to the gym and excited about it. I feel great and highly motivated. Nice smooth energy and focus that doesn't make you feel so "geeked out" that its not fun. So far its a great ride and I love the feeling. I'll keep you updated. So far, so great .