I have used a Beyer m160 for vocals with success in the studio, I imagine it might be problematic in a live setting because it is very sensitive to pops from plosives, a pop filter is essential with this mic.
I have used the M160 with vocals too.
A singer with an high voice. He sings progresive metal (Something like Dream Theater) and the condenser mics didn't work well, then I put the M160 and we recorded 4 songs with it.
The M160 isn't my idea for the voice, but with that singer it worked fine.
Now I think that with a SM7 he could to have sound better.