I haven't found a brand of thread I don't have at least one spool of. I have one spool of hand dyed thread from England $12 for 100 yards. It was a door prize at quilt shop opening. The shop never did sell one spool of the stuff and she ordered lots of it. The owner wanted only the best of the best but forgot who her customers would be. (the shop went under in less then two years) I like all the good brands. I use Connecting Threads cotton and their new poly the most and I like Fil Tec, Superior, Coats and Clark, Guttermann, Star, YLI, Robin Anton, InvisiFil, Signature, and Sulky. Aurifil is good but not worth the price to me. I ask for samples at thread vendors when I go to quilt shows. Most will have a sample packs put back for sale. My machines will sew with all of the brands of threads. I do love machine quilting with silk thread. It's like sewing with air. Superior had a great introductory sale for their new line of silk and I stocked up.