I did use them all the time but only in embroidery as they are not the same weight as the thread you should be using to quilt with. Several years ago I was embroidering lace jackets for balls for the christmas tree and absolutely tore up my Bro1500 machine to the tune of $700.00. It still needs repair as I bought my Bro4000D instead. You could not give me the wound bobbin thread factory to use in my machine. By the was I was using plastic sided bobbins so donated several boxes of them to CareCaps for use in her 15 Janome Decor computer machines. She has never had a problem while I lost an excellent and expensive machine. It used floppies and that I really liked.