I bought a sure wireless microphone at $275 they had one at $365, I should have purchased that one. The one a have is lacking quality. I would imagine it would be good to use by someone direction dance or exercise it has that type of sound.
I recently purchased a wire headset microphones, at Radio Shack and a hand wireless microphone in a Target store The price, $29.99 each.
Quality, is acceptable for $29.99 its great. I am not sure of the durability.
I do not find a need to have wireless while sitting at my keyboard. You have to have the wire, the battery pack and the controller on you. With a wired headset I have one wire from the microphone to the keyboard.
Question to ask;
1-How much do I wish to spend.
2-How much quality do I want.
And Tony Mads is correct Do a search on your topic on the general arranger forum, the topic has been discussed many times.