I have the Fiskar's one I bought years ago when I first saw it in the fabric store. It uses a 45mm rotary blade and I bought it thinking it would be safer to use then the regular rotary cutter and it was something new. I like new quilting tools. I put a new blade in and couldn't get the holder back together and Fiskar's sent me a new blade holder free. I think it was beyond it's time, and would sell much better now.