Craigslist has always been shady to me, but it does seem that it's getting worse as time goes on.
A good friend of mine was scammed on a CL purchase a few months ago. She replied to an ad about an iPhone 4S and ended up meeting the guy to make the purchase. Everything appeared to go well until she brought it into a Verizon to activate it when she realized it was a Jailbroken iPhone 4, not a 4S. Apparently she checked to see if it had Siri, as this was the only way she knew to tell the difference between the 4 and 4S. Being jailbroken, it had Siri hacked onto the device, so for someone in her position, it was almost impossible for her to tell the difference until it was too late.
Needless to say, I told her if she's ever gonna do something like this again, she needs to let me know and I'll go with her. Lol.