CL - You can hit the lottery and find a real buyer and boom, cash in hand. otherwise, it's a terror. people just suck.
I have now, successfully sold most of my stuff on CL; the direct benefit is zero comeback if the sale goes through. If you use PayPal and you have someone who knows how to game the system, 'buyer protection' becomes a nightmare.
Once you get used to it, it's pretty clear who's who among scammers.
1) Local/Cash Only --- anyone who talks about something else, or you driving 50 miles or mailing it is 99% a scam
2) Make sure they know you're going to meet some place with security cameras -- if they take your stuff and run, don't chase 'em, call the cops (Chase Private Client has been superb about this in Fairfield County CT; they even gave us a desk to sit at once!) -- if it's over a few hundred, meet at a bank and let the bank 'count' the money for you; it does a counterfeit scan
3) Ask for a cell, google any info they give you to make sure it's a real person
Out of everyone I weeded out via e-mail/phone, I only met one guy who was an odd duck (tested a lens for 40 minutes) -- I'm super paranoid but I've been surprised the rest of the time how very nice people are.