Ebay? Craigslist? Gazelle? UsedCameraBuyer?

Everyone has heard about selling things through eBay or Craigslist, and many people have done so.  It can be great, but it can take a lot of time and be a big hassle.  I have had fairly expensive things, like a laptop or a camera, get "bought" by a scammer at the end of an eBay auction.  They want you to ship the equipment to some far off country, knowing that their payment is worthless.  You have to file a bunch of complaints and restart the auction.  Yuck.

Along comes an easier model.  You go to a buyer's web site, tell them what you want to sell and what condition it is in, then they give you a price.  If you are willing to take it, you ship your stuff to them and after they verify the condition, they send you the money.  Fast. Easy. Reliable.

So far I have used two of these:

• UsedCameraBuyer was good for selling my old Nikon D200 DLSR and a lens that came with it.  They were a bit slower than I hoped though.
• Gazelle was great for buying old phones and other electronics. When I moved to Verizon on a new iPhone 4S, that left me with an AT&T iPhone 4.  Gazelle bought it from me for $170 and paid for the shipping. In fact, if I took payment with an Amazon gift card (and I did), I got another 5%.

I was pleased with both of these services.  Has anyone out there tried others like this? Any advice of ones to try or to stay away from?