I happen to agree with Diki and DonM...

Singers with a strong voice and a wide range would want nothing to do with a fixed mic (headset included)..They know the dynamics of their voice and know how to anticipate the increased volume..also the changing of the tone via mic placement...Two things you can't do with a headset..

Maybe a mono tone singer like Garth or Jimmy can live with it..but real strong vocalist...no way..