One came with my longarm and I find I can rewind my bobbins for my sewing machines on it too. That's a plus if ever the bobbin winder on the sewing machines dies on me. I also can adjust the tension on my bobbin winder too.

does it wind m size bobbins?

I use an Innova bobbin winder for my Innova longarm. A couple of my friends who also have it don't like it, but I've never had any problems. I believe most longarm manufacturers make bobbin winders for the M bobbins.

I agree it’s a must- have item. Mine came with my long arm.

Right on - Must Have!

The stand alone bobbin winder that I purchased is from www.fancyquilt.com is called a K-Kraft Super WInder. It is a great machine and I wind all my bobbins on it. It will wind featherweight bobbins, regular sewing machine bobbins and size M bobbins for our longarms. It is one of my best purchases and it's made by the owner of FancyQuilt right here in the USA!