I found mine for $500 even shipped, was new in box, and hooked it up myself.
They are nice, but have one bad quirk, if you program the unit to record OTA, and happen to on that OTA when it starts recording, you are screwed until it is done. I just remember to make sure I am not on the OTA I set for it to record.
Otherwise, seems pretty stable, I have had to reboot once since I had it.
Most thing you buy with credit card give you 30 days to return it.