I used Craigslist for the first time a few weeks ago. I listed a cheap Chinese upright bass and within a couple minutes of posting the add was getting emails. I phoned a couple of the people and setup an appointment for a guy to come over the next day and he bought it right there. Sold my bass in a little over 24hrs, then the next day found an old Lute that a friend's brother was selling for the same price I sold my bass for, and bought the lute that weekend. I recommend it, though one problem I have is people using dealer's pictures when they list something for sale.