From what I've heard Amp02 but Jack3d is no hell either. I had customs seize the Jack3d from me so I got the Amp02 coming now. Its gonna make it this time tho....
Im takin jack3d its goood as fuck. I do tend to get a little irritable 4-5 hours after but whatever i think every product will do that, the comedown off caffeine lol. I do like it tho, havent tried Amp02 but now that its at needtos store i might try it!
Jack3d is the shit! I'm going to order Amp02 to test it out, but I can't see it being any better than Jack3d...maybe the same, but better would be hard.