My machines don't seem to care, but I find Gutermann to be way too linty and breakable. Just went to Aurifil and love it! Clearance prices at www. Tristan.bc.ca made me try it. Thanks to Candace from Elk Grove CA for that tip. Also like Masterpiece by Superior threads. But haven't tried Isacord, YLI, or Connecting Threads. Just my two cents. Superior Threads has lots of education on their website.