For garment sewing I've used Coats & Clarks for over 50 years with no problems. Not experienced enough with quilts to comment. I sew on Berninas without problems until lately. The current C&C dual duty threads are made in Mexico and are "polyester covered polyester." I first noticed it didn't have the sheen like the cotton covered polyester, and it's stiffer and doesn't look nice on the fabric. Recent problems are that the spool sometimes jumps and the thread will be wrapped around the spool holder, sometimes breaking, and I've had to unthread and turn the spool upside down. I think I want to switch to another brand but I sew for charity and lately the institution I sew for gave me about a dozen spools of C&C so I guess I'm stuck with it for awhile, unless Hancock's would let me exchange it for Gutterman. I have bought vintage thread on eBay but it's getting scarce.