I bought the Sidewinder yesterday from Beverly's fabrics with a 40% off coupon. The bobbins from my Pfaff and Janome Gem Gold fit just fine.Also the Singer bobbins I use in the Janome fit well. I use mainly cones and put those on my cone holder to wind the bobbins with no trouble at all. So far I love it. I think it will be a real time saver!