Until recently, I used to put on a style file that was nothing more than a bass with finger snaps, pick up my wireless, handheld mic, and walk through the audience singing "Fever" to the ladies. THEY LOVED IT! I have a new wireless system, but haven't had the time to do the installation of the receiver and power pack.
And the ability to move around the keyboard, stand up once in a while during the middle of a song, and never loose contact with the mic position is another example of the advantage of using a headset mic. You can have a lot of fun on stage, especially when you're in motion - it can be contagious.
Cheers,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)