At first I did not like the Sidewinder. It wound too loosely....but then I realized I was not leaving the thread AGAINST the bobbin (where it should be) I was making it go behind the little lever....anyhow I got it straight. Now I can wind 15 bobbins in about 10 min.....nothing is better than to have a stack of fresh bobbins waiting for you. try it you will like it even if your machine winds them....most do but it is the convenience of having multiple bobbins ready for you.