I also have the Janome 6600 (for about 6 years) and would have a hard time choosing a new one. This one has all the bells and whistles that I couldn't live without and runs like a champ. I have NEVER had anything I couldn't sew - last week had 8 layers of heavy denim when making a purse and the Accufeed zipped right thru it. If you've had a 6600 and upgraded what did you choose and are you as happy with it - that is of course if you were as happy as I am with my 6600. Thanks!