I've always used machingers until recently when I just didn't think and started quilting. I was about an hour into it when I realised I didn't have to take them off to changed the bobbin. I looked back at what I had just done and fortunately, it was okay but I thought I could see a slight difference in the curvy places so I know I will be trying this out. After all, what's to lose? (And I might just buy some for the dishes too!)