I would have done the same as you, for 45 bucks, I just looked at avSatellite on this site, out the door you are looking at about 160 bucks, unless he has a sell going on.I had the 1.2m dish at 89w plugged into the x2 and swapped receivers with the MDH and scanned that sat just fine, which tells me that it does work as it should and didn't get scammed.
There were times where used receivers were real good to get. That is when most everything was DVB and the "software pirates" just got shot down so they put stuff on Ebay. Picked up a ton of old DVB receivers and other than a simple software flash and it was back to good.