It depends how you quantify reef safe...
As a juvi, they're pretty tame and mild.
As they mature, you'll begin to understand why they're also called the "rock mover wrasse". They move/flip anything they can, and you'd be surprised how large of an object they can move, in search of food. They'll also go after inverts as they get larger too. The "dragon" appearance goes away as they mature as well, and are certainly not as visually appealing.
And yes, they reach a foot in length.
IMO, they don't belong in a reef. Corals are at risk, not of being eaten, but rather by being crushed by moving rocks.