My main machine is a Bernina 440 that is 7 years old and is has been wonderful. It is a pleasure to sew on. I bought it used, but it has never given me a bit of trouble. I have the embroidery unit to go on it, that was part of the package deal at a very good price. I also have a Bernina serger I bought used (although the Bernina sergers are made by Juki) and a vintage Bernina 910 for a backup machine. They are all great machines.
That said, I also have 2 Featherweights and a bunch of other vintage machines that I enjoy collecting and using. The 440 is my favorite, however.