Dandish,
I hear you. I thought the Horizon was a beautiful machine. If I didnt have the trouble sewing over a simple intersecting seam I would have decided to buy it. I was dissapponted. And yes I could have the tech look at the machine and make sure this would not be an issue with my purchase, but I just was not up for anything iffy. We tried all three of the feet you mention, plus the regular all purpose foot and none of them worked on either machine at both dealerships. The 6600 does everything I need it to do. Im so happy that your machine works flawlessly and Im sure that many people feel and have experienced this too. I am getting the FMQ foot that comes with the 7700 for the 6600 it is so great!
and also some other feet. Including the accufeed feet.
Happy Sewing!
Thanks for all the good advice.
Nancy