I used it in my biceps and they didnt turn out like anything you pictured. I beleive there is a proper use and abuse/over-use.
My biceps look more even and full,,,not fake or abnormal like the abuse situations.
I have seen guys who did it properly, just enough to fill out that extra bit that they cannot seem to get to and looked good. But then again, like I said, they did it properly, the right amount over some time, not freaking cc's at a shot, and they went deep. However, these 2 guys in the videos you linked to, nah Bro, neither of them look good, though Chris looks better than Brad.
I used it in my biceps and they didnt turn out like anything you pictured. I beleive there is a proper use and abuse/over-use.
My biceps look more even and full,,,not fake or abnormal like the abuse situations.