Both craigslist and ebay suck. Craigslist as said above is haven to general idiots and lowballers, pros are instant cash/payment and no fuss if you meet in a public place.
Ebay is great for reach and ease for the customer but sucks major for small-medium time sellers because:
we can't leave negative feedback for dumb buyers

PayPay + eBay tag team double dip fees
scammers rampant on high value items
not enough "comfort" settings for sellers (i.e. high feedback only/ CONUS only etc)
Too quick to side with buyer
Not enough protection against chargebacks (though paypal will institute a permaban if one decides to place a CB)
I'm sitting on lots of unused valuable electronics that I could "sell" in a heartbeat on ebay if the price is right, but after 5 years of selling i'm starting to realize it just ain't worth it anymore.
Protip : If you have funds held you can issue a refund and have the entire amount of the funds released. I did this when I sold something but there was a postal issue on my part, and gave the buyer $5 bucks off the purchase price. Paypal sent the refund and placed the rest into my account.