I have used them in my Pfaff Creative 2.0. It seems to make the thread reel off more smoothly and it definitely has helped me with birds' nests. However, when I got my machine serviced a month ago, the person at the sewing machine store told me that it needed a timing adjustment. I haven't had a problem with birds' nests since, but I've only used Pfaff plastic bobbins since I got it back. But I'm holding on to those bobbin washers if the problem arises again.