It's a strange one, though.
I have never used a headset, and I think I would find it a bit strange; what being used to being 'glued' to the mike, it sort of keeps me anchored.
I would be afraid it would make me look like Garth Brooks, or somebody.I would use one, of course, if by doing so would make me the money he was making!!!
Downside of it, though.
Sometimes when you have to clear your throat, and you choose the the end of a sentence, or the end of a verse to quickly turn away from the mike, and 'cough', you can do this without having the audience aware that you have just done it.
With a head-set, you can't really do that 'off-mike', as it were.B.