I'll be interested tolerance how you get on. I've got a 7700 which, I'm ashamed to say, has had very little use in the 4 or so years I've had it. I've resolved that that is going to change, and in the next few weeks I plan to learn to use it properly. My older Janome (4800) HATES cotton quilting thread. YLI and Superior King Tut both jam all the time. It purrs along with the synthetic Superior threads such as Rainbows. It's going to be interesting to see if I'll be able to use up my stock of King Tut on the 7700.