I have taken pretty much a majority of the preworkout supplements out there and have stacked some of them too, but let me tell you...nothing, and I mean NOTHING, compares to n2amp. The pump is disgusting! Great energy focus and pump. Like mentioned above if you stack it with ntkts, look out because you transform into something else lol. I took a full serving of n2amp, 8 pills, and 3 scoops of ntkts and I literally started throwing weights around. It didn't matter what you out in front of me, I killed it! My friend who was training with me actually got scared because my inner demon came out and just had to lift. My drive focus and energy were insane. I had veins poopin out of places I didn't even know existed (and I'm around 12-15% bf). Your skin literally feels like it is goin to split open because there is so much blood in there. Due to all the blood and oxygen flowing through you, you better believe that it helps shuttle that post workout shake, or meal, straight to your muscles.
Sorry for the ramble lol, I just love these products!! Will never train without them again (if I can help it).