Audio Systems: Wireless headset microphones, wireless headset microphones, amateur theater group

Question
Kyle I have seen the Pyle PDW-.4400 4 channel wireless headsets available. I am a member of an amateur theater group and these seem to be a viable option. Our hall is quite large and I would need at least a dozen microphones.
I have not done the conversion from your US dollar but they still seem to be the right price at least. I worry though after reading an answer to a similar question that these microphones may not last and that the price may be 'too good to be true'.
Australia is a long way from the dealer if they fail to work in a short time.I am asking for your expert advice. thankyou Daphne

Answer
They are about $120-$160 American. I haven't had any first hand experience with them, but that is extremely cheap and most of the time you get what you pay for. Every other reputable brand is double that price, but without first hand knowledge I can neither recommend or discourage.