My sister has one and she swears by it. However, I think it's just a waste of money. Most machines have a bobbin winder on them, so why spend your money on something that's already on your machine? You could put your money towards ( like more fabric!). These little machines are pricey too. It is too easy to spend a lot of money when one walks into a JoAnns or quilt shop. If I spend my money I would rather do it on quality fabric since that's where the most use will be.
It's this easy: spend your money wisely. Ask yourself do you want it or need it.
Gotta go to my granddaughter's birthday party.....she gets the quilt I just made her.....