Speaking of Pros: Horst Vegas, self-proclaimed Senior Boy Wonder of Magic and an unfailing Lota Bowl of Wizzdom, shares another of his tinny-tiny Golden Showbiz Rules & Recommendations:
There are a million details that separate the great performer from the average one, but these are the most obvious ones to me: full technical, psychological and theatrical mastery of the trick, stage movement, efficient routining, showmanship, and audience command on the one side; haste, overproving, lack of drama and lack of personality on the other.
Addendum: There is a good discussion on this matter over at the Genii Forum!
ZZZAUBER 