Well, a different opinion about buying a machine from Craigslist--you should try any machine you buy and unless you know to thread and run many different machines, you may have trouble being sure that a used machine is really in good working order and won't give you trouble. You won't get a warranty or any help from a Craigslist seller if you have problems.
I've bought three used machines from my local Bernina dealer, which were tradeins. They were carefully checked out and serviced before they were put out for sale, and they actually guaranteed them for a short time--I think 30 days. I got a really great deal on each of them, and the store personnel can help you figure out how to thread them, etc. and you can try them out right there at the store. Hope you have a dealership where you live! That's my recommendation for you!
Dana