I have a forty year old Pfaff that has a slightly bumpy surface so trying to FMQ was difficult, like it grabbed onto the fabric. I used the slider and it made all the difference. I never had it roll up or anything. Once in a while I run it under the faucet to remove all the dust and thread puke and it holds just fine. Even now, years later, because of the surface of the machine, I need the slider. I think it's awesome.