I went to the dealer to get a new bobbin casing and a tune up. Before I could stop myself the words: Why don't yoy show me what you have?" were out of my mouth. I got an excellent deal on a Pfaff closeout model.
If you need it, you need it. I so (sew) get that!!!!!!!!!!!!! Sorry don't know about the 6600 but my friends swear by their Janomes.