I love craigslist - I've gotten free stuff, bought and sold guitars and amplifiers, it's a great site. And pretty much all the people I've met in my dealings there, have been nice.
BUT - there are also a lot of flaky, even crazy people there. I've usually been able to weed them out from email responses. If something smells fishy, my advice is to walk away. Especially when dealing with craigslist.