I have one, and it works very well. Now the first one I bought quit after a couple of months, so I returned it to Wal Mart and exchanged it for a new one. It was quite a help when I just started sewing and had a basic machine because I broke the spring on my Singer's bobbin winder. It is nice to take to sewing groups so everybody could use it when they neeed a new bobbin. I have heard that it doesn't work with some machine bobbins though, but haven't had that problem myself and have a Huskvarna and a Janome.