I was really impressed by this NRG-X Labs Overdose. It had all the elements one looks for in a Pre-Workout product.The energy level was high without any jitters. I experienced good focus and I was pleasantly surprised by the pump, which I did not expect considering the name of the product. Helped give me some of the best workouts I have had. This is the 'old' formula, so you better stock up while you can still get it.