I have used Mettler, Guttermann, Sulky, Mediera, Aurifil, and once I even used Coats and Clarks. I haven't have any issues with any of them in my Bernina 830 Embroidery Machine. However I hated Coats and Clarks because it was so linty. (I used that word, too, Mattee) I just recently got some Presencia 50 wt cotton that I used on my last quilt. I absolutely loved it and so did my Bernina.