OK, so I ordered Amped AF, and first off, very fast shipping. To keep this short, yes, it's very strong, so it works very well. I'm extremely pre-workout desensitized ( I really need a month off of powders, lol) but I believe the DMAA is the key to the stamina and stimulus needed to have a crushing workout. It really does make you wanna be at the gym and put in the work even if you're dead tired or unmotivated to lift. I'm all for skipping a day in the gym IF you need it, but if I didn't go everytime I was tired, I'd never make it. I've never been one to feel "focused" from a PreWO, but this stuff really does help you harness in the mental capacity needed to endure a great workout. And I've not gotten the craps from it either, which of course is nice. The Insane Labz Psychotic, which I do like, started making me a have to crap every single time after the first week. Weird. So, in closing, Amped is a win in my book, I just wish the price was less.