I went to my local sewing machine shop and was delighted to see they had the new bobbin case for FM quilting for my Janome 6600. I bought the only one. I tried it out tonight on a practice sandwich and I must say I think it's pretty good. I did a lot of things I normally wouldn't do while quilting, just to see how it would perform, and I saw a real improvement. Virtually no "eyelashes" on the back when I revved up the motor and skidded around corners and did some slingshot angles.
I paid $28 for it and I'm really happy with the purchase. It's definitely worth the price.
Sunny