Just an update on my recent order of a refurb:
Detector in good shape, fingerprint on lens is only small flaw found (easily cleaned off).
Latest 3.851 software.
New cups and wiring.
$359 price plus ship.
Definitely not a brand new set --
Manual had small creases on corners that indicate it was used.
Detector had been programmed -- P showed up on initial turn on indicating that it had been changed from factory defaults.
Delay in shipping. Got the 'don't have one in stock' message on my order. Took 5 days for them to actually ship.
Seems to work well. Need to adjust to new alerts from my 8500 (had for 5 years).
Maybe I was unlucky to get a used one or maybe they are all used. Just don't be disappointed if the one you order is not brand new. Some on this board insist they all are new.