I have had my 6600 for over 5 years,bought it used from a local SM dealer in town.I think I paid about &1800 for it then. It is a work horse! I have it maintaineced yearly and have had no real issues. I have a friend that had one, and dropped it while transporting it (they are heavy) and loved it so much she had it 'fixed' / rebuilt instead of buying something new. I wouldnot trade for mine.
I do have 2 others (all Janomes)one for embroidery & the other a 3160 for retreat, classes & takng camping. You can't beat a Janome.