Agree with Stein, in my experience with buying eBay avionics, you have to research your seller. If you check his/her history and see they routinely sell a lot of avionics and have good feedback ratings on them, then that seems to be a safer bet than buying from the guy who usually sells household goods and now all of a sudden he's selling a Garmin GNS 480.
For the most part, I've had good experience on eBay and Barnstormers avoinics purchases, but you've really got to do your research before buying on the product you want as well as the seller, if it's too good to be true, then it's probably junk ... I did get one unit a number of years back, a King DME, for a 'great price' that worked fine for about 15 minutes on the bench then quit, turned out to be a bad power supply and cost $250 to replace, ended up selling it after the repair yellow tagged for just a little more than what I had in it so it was a pretty much a wash.
With the internet today, there's no reason you should not know most if not all of the repair quirks and maintenance issues with whatever piece of equipment you are looking to buy ... if there's a common problem with a particular unit that is costly to repair, you can bet that the "good deal" unit on eBay has that problem.
Happy Flying,
Reggie
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