Not sure I agree with the change an hour after taking it. Surely it takes a certain dosage to increase your levels to the level you notice it.
I took a cycle of these pink thais and they were good, gained 21 lbs in 8 weeks, however i didn't notice too much of a change until around 4-5 days on them.
I think you being able to train harder after just a couple is a placebo effect.
This is only my opinion and experience of course.