My Ebay experience (as an international buyer) so far has been good.
Now, the only camera I purchased was defective (it was stated in the auction), but after emailing some Pentax experts I decided to take a risk.
A CLA fixed it, and nowadays this is my main camera (Pentax ESII).
There's an enlarger (without the baseboard and lens) on its way. Let's see if it was a bargain or a lame duck...