When I've been making bulky items, or trying to feed a big quilt through the machine, I've often had it running away from me on the table. With this non slip backing, it doesn't go anywhere. You can push quite hard, and it will stay where it is. Even better, it's washable so I can still wash the mat when needed. I can still protect the table, have somewhere to stick my pins and my machine stays put, can't ask for much more.
Having tried it for this, I have an idea for other uses too. Watch this space.