I was fortunate enough to get ahold of a used (3 months old) Xwire XR905 and would like to know if it is the preferred one. It sais "20 Bit Digital Audio" "Dual UHF Receiver" "Four Antenna Quadiversity" on the front. I can't tell the difference between that, and my Monster Bass 500 cable. Also, I read these were ultra reliable. Is it true? I don't know if the warranty would still apply. It sais transferrable, but it may be the older model.