I have been using it recently in my sewing machines and really like it. You can get almost double the amount on the bobbin, I had to lower the upper tension to 4 (normally on 5) and the stitches just seem to disappear in the fabric. I buy it from SewThankful and they have a sale going on right now. Good luck.
http://www.sewthankful.com/SuperiorB...500spools.html