I just started taking Spike last week. I did the one pill a day for the first three days, and bumped it up to two since then.
Spike definitely amps you up, but completely differently than ephedrine-based products. My heart wasn't racing, but I felt like I had more energy. Sort of like a focused sense of clarity.
I was taking it in the morning, but the other day I took two an hour before lifting. I got to the gym to do some chest, and ended up beating my previous max by about 10 pounds (I'm not big, guys- my max is about 215). Then, after a negative drop set, I did dumbbell inclines, and topped my previous max by a good 15 pounds (I went from 55 pound dumbbells to 70 pounders).
I can't offer any information beyond that. It might be that it was a psychosomatic experience, but whatever the root cause, I can say that at least for the one week I've been taking Spike, my workouts and energy levels have improved dramatically.
Have any of you been taking it long term and if so, can someone speak to the long term effects? Do you build up a tolerance to it, or do you find that it consistently works?