I can tell a big difference using the Bobbin Genies. You have to take the tension spring out of the bobbin case for them to do their job. They stop static build up with metal bobbins in metal bobbin cases. One thing I noticed using the slider is my extension table does not get scratches. I leave the slider on for piecing. I cut the needle hole bigger. I guess I think differently, when I buy something that I don't like how it works, I don't feel like I wasted my money. I want to know if something works for me or not. That's why I bought it to find out. That's why I have two brands of Sliders, I wanted to see the difference.
