Calico, fundamentally it works the same as the Grace one, in that it speeds up and slows down as you do (theoretically). Remind me -- does the Grace Sure Stitch come to a full stop if you stop moving? The Bailey one does not do that. And frankly, I don't find that it follows my speed correctly -- you have to move at the same pace, which to my mind, sort of negates the point of having a stitch regulator.