I used to use cone thread but had some bobbin area issues with my Janome 6500 and was told it was because I used the cone thread. So now I use aurafil. Too pricey for me. The machine is a bit of a thread snob because it doesn't let me use Coats and Clark either while any other machine I own does. Waht is even more odd that some one else had the same bobbin area issues and was told it was because she needs to use cone thread. I might give it a shot again. Sure a lot easier and cheaper.