CL tends to be decent. But people on there are often not very informed. The two ukuleles I've sold were via CL.
Two days ago, I sold my KTS-4 to someone who has no idea about ukuleles. It's for his husband who's graduating later this week who wants a really good starter ukulele. When I met him, I took it out of the case and handed it to him. He looked at it and said "I don't know what I'm looking at...".
I went through the basics, he handed me $340 cash and I drove home. He's a professional oboe player, so he recognized some of the things that hint to the quality of the Kiwaya, but... I feel that were I the type, I could have BSed him on a number of things.
At bottom CL makes a good marketplace. And I full agree with what many have said - get high-res pics, get to hear it on the phone/sound sample where he mentions your first name, something to establish it.
Besides, if you're picking it up in person it's not because you're seeing it that you're necessarily buying it. When I sold a motorcycle a while back some people came to look at it but didn't buy it. It's normal and you shouldn't be pressured.
Mahalo UK-LTD2 (sold), Kiwaya KTS-4 (sold)
Luis Feu de Mesquita Tenor
Rock out with your uke out.