Because it only takes three pieces to activate an armor set bonus, that has me thinking: Some legendary armor pieces have tier three mods that can benefit any class, as they aren't modifying a specific skill. And because you can only change one mod, it would be ideal for the built in tier three mod to be useful to your class.

So in some rare cases, it seems like it might be useful to use a legendary armor piece intended for a different class simply because the built in mod it has is more useful for a given build.

That said, are legendary armor pieces locked to specific classes? Or can anyone use them, regardless of their intended class?