I use Bottom Line all the time. I have 2 Janome machines (one is an embroidery machine) and a sit-down George quilting machine. Bottom Line Prewounds are my bobbins of choice as I keep several different colors to do the quilting on George & I also use them on my Janomes. They hold a bunch of thread so changing bobbins is less frequent. I also purchase Bottom Line on the cones to use for my top thread. I have never had any problems since I started using Bottom Line about 8 years ago. Enjoy your quilting.