I just bought the Creative Grids Stripology ruler and while it is a bit more expensive than the Shape Cut, I LOVE the Stripology. It's thick (grippy) plastic that is semi-flexible so it's not the hard plastic like normal rulers, but it has the slots so you just fit your rotary blade into the groove and off you go. My fabric hasn't slipped at all and I haven't had an mis-cuts. I've never cut strips so quickly! You do need to accurately fold your fabric twice (cutting 4 layers at once) to make it all fit under the dimensions of the ruler, but I haven't found this to be an issue for me yet. Highly recommend for accurate strips without spending a ton on a machine like the GO!