[Snakester]

I bought one car from Autotrader, and two (including my Viper) on E-Bay, and I've successfully sold 3 cars on E-bay, and unsuccessfully listed two cars for sale on Autotrader.

I actually like Autotrader better as you can search more specifically than E-Bay. Especially by location, mileage, options, and colors. Plus there's no messing about with unknown selling prices (reserves).

But I've personally had pretty good luck both buying and selling through E-Bay. The only trick is that you have to take tons of precautions to validate both buyers and sellers as being legitimate. And buying cars long distance is much more risky than buying locally.