I use Coats & Clarks Dual Duty Poly covered Poly. My mother always used C & C and my Great Aunt who died 15 years ago at the age of 93 and who was my quilting mentor only used C & C. I don't have any problems with it in my Janome. I clean out my bobbin case routinely to remove the lint. I have used Gutermann and Sulky if I am wanting to use a variagated thread or C & C doesn't have the color I am looking for. Thread is a machine and personal preference.