Took my first 2 cap dose yesterday morning, not pre-workout, just to start the day off.
It kicked in about 20 min after taking it, and had an initial potent kick. Tons of energy, plenty of focus, and a good overall feeling of well-being. No nervousness or anxiety.
Two hours later, still experiencing all of the above, but energy was slightly less, in a good way. It wasn't ever jittery, but after two hours it was just a little more "comfortable." Of course it is early to tell, but I give an initial two thumbs up.