Although I WOULD like to use strictly Aurofil, I simply can't justify the price so I use CC Essentials, although it's a little lintier, than Aurofil, I get a lot more bang for my buck with the Essentials and my machine likes it just fine, I just clean the bobbin case every 2 bobbins, no big deal. I've never yet had to adjust my tension because of the brand of thread I use.