You are not alone. I had the same problem with the Revolabs xTag wireless. Recognition was poor, consistently poor sound quality on the microphone setup check. I also gave up the wireless route. I am very happy using a Speechware USB 6-in-1 table mike.
I am also a recovering Revolabs xTag wireless user. After 2 of them, I finally discovered my 3in1 TableMike and have never looked back.
Dave
FP