I have every size of Quilter's Select rulers now. I bought one to try and went back and bought the rest. I have the biggest QS mat too. The rulers are wonderful, non slip, thin lines, non glare. The mat is smooth and heavy. I love the cut and turn with the rulers. Nothing slips. I went to a class this past week and learned how to use a rotary cutter properly. I and everyone I knew uses it wrong. LOL The blade should be very loose, no pressure to cut, do not have the button set so you have to squeeze the cutter to cut. Never squeeze a cutter not even the ergo ones. We spent an hour on proper use of a rotary. No one had been taught how to use one other then watching others who weren't using them correctly.