Eventually bubbsy your body will become immune to the formula and the "buzz" will not be there. When this happens it is past time to "cycle off" because you are just wasting your money.
The trick with these pre work out supps, especially those containing creatine (which in large continuous doses is terrible for your liver), is to cycle on and off every 6-12 weeks. I have in the past taken creatine for 2-3 months to build up my size, then cut for the following 3 or so months. You can realistically cycle this stuff, or a product similar to it, 2-3 times a year. Use it to build up your size, then when you cycle off focus on maintaining your build up and you will lean out nicely as long as your diet follows.
Few facts on Superpump for you:
http://www.supplements101.com/SuperP...perpump250.htm
Remember to always ween yourself on and off of these products, start with half or less of the recommended dose and go up from there gradually. And yes, never take it within 4ish hours of sleeping, maybe 5 to be safe. I have made this mistake myself and know how it feels.
You can also pair that Super Pump with Size On from the same company, meant to be taken post work out. Basically what you are doing with these products is speeding up your muscle cells healing time, which facilitates muscle growth.
I like that combo, Shot gun has a great pairing system as well that is worth checking out.
I tried out this Black Powder stuff on my last cycle and was not impressed.. I will be going back to Super Pump for my next cycle in August.
Also to add the dumps will subside as your body gets used to it.. with any new NO supplement I take I find that it either makes me have to piss 1000x during a work out or crap my pants until my body has time to adjust.
Edit: Size On link
http://www.gasparinutrition.com/Home...0/Default.aspx