I have always wanted to try one and did so about a month ago...So far he is infact very bossy, but certainly not an outright killer (as an aggressive Trigger can be for example), I believe he just wants every fish to know he is in charge. He is selective in whom he picks on too, he has never bothered either of my 2 Triggers or my Coral Beauty, but from day one he didn't like my 2 Wrasses. Beautiful fish and very interesting, but be advised they are one of the toughest, and most aggressive fish there is.
As to the person that said they have a poor survival record, this is absolutely incorrect, in fact Bob Fenner considers them one of the, if not the most hardy Tangs there is.