First of all, I was a bit confused as I got 2 different size scoops, and the guidelines tells you to try out the dosage with ONE scoop first. While I read on some website to do 20 grams.. so I did 20 grams, which was between 3-4 scoops (the 1.5cm deep scope, not the big one that probably belongs to the protein)...
After 20-30 minutes, I got all warm and almost sweaty, and full of energy (tripping!). So it definitively works for me. I was a bit skeptic after reading a lot of forum threads about this being a bullshit product that doesn't give what it promises, but it did have a impact for sure for my case. But it probably varies from person to person. And I dont think this was any placebo effect, as I didn't expect it to work that fast at all.
When I went down to the gym and started warming up on one of those spinning bikes, I got SUPER-thirsty, and felt basically like having a overdose on Thai Redbull, so I went off the bike after 5 minutes, and even then I felt like I've been on it and biking like death were chasing me for 20 minutes (thinking of the pump in the legs). But the pump feeling disappeared pretty fast though.
When it comes to the weightlifting, I was barely able to do anything the next 20 minutes, I was simply too thirsty and felt like puking after every set, and still super-thirsty. But then it got better, and I felt that I could go on without feeling sick.
After this, everything felt easier and I increased on more or less all weights, doing shoulders and biceps, but I also went from 10-12 to 8 reps, so it's not solely the nutrition. So expect from feeling sick, I'd recommend the product for a pretty good energy boost.
Tomorrow I'll do the dosage correct, and see how it goes =) Feel free to add your experience with this product yourself, if any :-)