I've been selling on CL for years, and I've had really good luck. I've met lots of cool people, and I've been able to network with other drummers because of it. With that said, I had one incident last fall when I was selling a higher-end guitar. I always thought that we drummers were the lowest rung of crazy musicians.
This guy contacted my wife about my guitar (she had posted it on FB Marketplace for me). I gave him my phone number b/c he was asking her all kinds of questions, and I was happy to answer his questions as opposed to passing info to her. I texted him answers to all of these questions. Then he absolutely started blowing up my phone with texts...these long, rambling texts about how I should sell my guitar, how I should get it set up, how bad he wanted to play it, a guitar he was trying to sell, etc. I'm a college instructor, so I know some writers out there are long-winded, but there was just something about this guy that didn't sit right with me...almost scared me a little. I told him I was putting it in a local store to sell on consignment, and if he wanted to try it out (he lived an hour away), he could go there and pay the price that was on the ticket. I then blocked his number, and I never heard from him again. This was the only time I was uneasy about anyone I've sold to.
It ended up selling to someone locally. Thank God.