Shure SM35 TQG

I use this in a Theatre where we have a live band accompanying performers on stage. I do backing vocals and play guitar whilst sitting in the orchestra pit. The mic allows movement of the head while reading sheet music, without moving the mouth away from a boom mounted mic.

The only con, is that this is a bulky mic in comparison to lightweight unobtrusive head mics, but this was the best value and performance I could find that was not omni-directional.

The big pro is the cardioid polar pattern and resistance to feedback.