This a great mic for many applications. It works effortlessly on Guitar amps and Snares as well as Acoustic Guitar...well just about everything really. It can even be great on Vocals (voice dependent of course).
It's built like a tank to the best quality, like every Shure mic i ever used.
As for extra features....its doesn't have any extras cos it doesnt them.
Simply put, there is a reason every studio in the world have multiple SM57's in their mic lockers!
If you don't have this mic, do yourself a favor and buy at least 1!