I know I'm going to love mine! I have a 66 too, and only had her for a couple months. That was one of the freebies the shop gave me with the other attachments. I figured out in a hurry that pins hitting it makes it go wonky. I like you, need to spend a lot of time and stubborness to get used to it.
I will say that my 66 sews perfect circles, with no gather. It's awesome. My little Janome was eating them up. The 66 following the line great and I've been making some circular pin cushions. Works just fabulously.
I still have to figure out the FMQ part. That's coming soon!