Craigslist has been nothing but endless hassle for me when buying or selling.

Buying, for the reasons above.

Selling, because I get an endless string of questions to which I give answers from my large pool of bicycle knowledge, over and over until they end up saying they can't or won't or their car broke down or some bs or another and I'm not only that $100 or so poorer but also a few hours poorer too.