How good do you guys feel it is and is it worth crafting? Its 680 fully upgraded and agility proc with baseline versatility. I imagine it has a 55 second internal cool down. http://ptr.wowhead.com/spell=181650/stone-of-fire
I imagine that when you add the static stats in, it will be better than any Heroic BRF trinket, probably just a bit below Mythic BRF. And that's even after the switch from mastery to versatility.