What everyone seems to notice is a tremendous increase in ability to focus and volition (for lack of a better term). What is different among guys is varying degrees of becoming annoyed or even enraged. I personally never noticed that (quite the opposite in fact) so that's where I differ from most.bought a different brand halotestin and took 20mg today, anything I should be looking for as to whether its legitimate - I've never taken it before so, any experiences?