Like Candace, it sounds to me like your dealer is the problem, not the machine. There are generally advantages to getting a demo model - less cost, all the little startup problems solved. I've bought two demo models, and I was very pleased with both. However if you were told you were getting one thing and then got another, that's a dealer problem. Personally, I love my Berninas. If you already have one, you might find that a new one would be able to use a lot of the feet you already have (depending on the model). However I would recommend picking a good dealer and then the machine. All the big companies have good machines - Bernina, Pfaff, Viking, Janome, Babylock/Brother. Find a good dealer and the rest will follow.
Pam