I've really only had one problem where someone I sold something to here (for what I considered a decent deal - less than I paid for it and I thought I got a good price) who then claimed the box showed up empty. At the suggestion of people here, I contacted his postal deliverer who told me that was bs and so I told him his mail had been stolen after delivery and he needed to contact the cops. If he showed me a police report, I'd split the cost with him (refund him half). Never heard back. That was my first and last time dealing with someone who had under 10 posts.

Don't really sell stuff often as I don't have much of a parts collection yet. Someone sent me something for the cost of shipping once (used cassette), and I pm'ed him a thank you note (or so I thought). He wrote me a week later asking if I'd gotten it, and, apparently, I'd written him a note, but closed the window before hitting send (I hate how when I get messages the mailbox opens in a new window rather than a new tab). Still feel bad about that.

Selling small items on CL hasn't been a problem, but larger items (furniture, bike, cars) I get inundated with the sob stories to the point where I hate using it now.