I sew with a lot of metalics -- the only thread that consistently breaks is one of the sulky metalics (not all colors, just one). The first time I had trouble with it was in my Elna Supra, then my Pfaff and both of my Janomes. I avoid the color -- not all of them. I don't like invisible thread so I have not tried it. I sew with the C&C all the time -- it and Superior are my go to piecing threads -- and quilting threads. When I can get RA or Aurifil at 50% off, I buy it. My favorite metalic is madeira -- it has tons of colors that I can use to add a little bling.