None of my experiences are from folks on this site. It's a combination of Armslist and a couple of Facebook pages dedicated to gun trading I have had quite a few deals with folks here and all have been great. I guess I should have said that to start with ;-)
See here is all good but go to Armslist and Facebook well..... I had a shotty for sale and all the Armslist guys were a piece of work trying to ding me down on it as the stock was cracked..... It is a common issue with a 50 yr old gun.....
But even on here have had issues. My best one is the people who do not answer your question as posted earlier. I really want to call them out in public but just bite my tongue and move on.....