To me the most important part of my machine is the service I get from the seller. I have purchased 3 top of the line machines and after having minimum support from the first two I was very careful before purchasing the next machine. My dealer has free classes for learning the software and the machine. She has many classes one can take for quilting, sewing, embroidering. These classes sometimes come with kits that are reasonably priced and the staff will always help you pick out fabric for your project. At least once a year my dealer sponsors a special class. The last one was a foot class. Sure was fun to learn how to use all the different feet. We did not have to purchase these feet unless we wanted to. This gave us a chance to try them first.
When I am having trouble with something I can phone her and she usually can solve the problem over the phone. If not she has a technician that can. Sooo to me SERVICE from my dealer is the most important thing.