We have the 6600P and just purchased the 11,000. I have had the 6600p for 2 years I would not trade it in both are great machines.
I have a Kenmore 45 years old never needed repair I used it in my Bridal shop foe 19 years I had 5 sewers using it 6 days a week, I found out Janome made it. I still use it all the time.
I am a believer.