I do kinda agree with jda. But have a funny story kinda related -
My shrimp would "freeze" my pink tail in it's tracks by putting it's antennae (sp?) on each side of the trigger. Froze dead in it's tracks everytime (kinda like when you turn a shark upside down, it goes into a trance...same thing kinda) the trigger wouldn't move, would get pale and do nothing until the shrimp moved away.
I have known many other with the same triggers I listed and would not really call them too much of a threat - recommend with SPS, LPS, softies, inverts (shrimps, snails, hermits)....sure.
Triggers with an underbite a typically considered reef-safe. 100% is a crosshatch, but you will have other problems with those.