I'm going to chime in for a moment. I'm totally partial to APQS. Our machines are easy to use and have few problems you can't fix yourself. Customer service is exceptional and second to none. I've called one of the company reps on a weekend and we troubleshot the problem over the phone, yes I held the phone up to the running machine. She knew what the problem was and I had parts by Monday. If you can't reach a rep, someone on this forum can usually talk you through a resolution. Used APQS machines sold through the company are completely checked out and refurbished/updated with grease etc. They also come with a warranty. You can trust most used machines sold by the owner. Like Helen stated, machines are sold due the things she mentioned, other's trade-up to newer models with more features or throat space. APQS machines devaluate very slowly and last forever, as long as you maintain them. We can tell you what we love about our machines but you really need to "test drive" them to know exactly what you want. Any APQS quilter in you neighborhood will usually invite you over for a test run. I think you're on your way, asking questions like you have here is smart. Have fun on your adventure, hope to see your quilts here in the near future.
PS: What other company lets you be a member of their forum, no matter what machine you own? Need I profess again, CUSTOMER SERVICE!!!!!