I have bought 2 from guys on Ebay. The first one one was a 5hp gamefisher. It came all busted up from poor packing. The good news is that I got 100 bucks from the insurance......so the motor cost me about 50 dollars and I replaced the parts cheaply. (13 dollars)
I also got my 35hp Evinrude off of Ebay. The guy has great feedback and mostly sells outboards. When it arrived, the cowl (hood) was cracked. The seller sent me another one.
So, I look at these as 2 positive transactions, but for a short while, they were headaches.
Also.......make sure you do your Ebay transactions through paypal......that way, your covered!

I have made over 400 transactions with only 2 bad ones. I was really glad I used Paypal. I got a refund on both transactions pretty fast.