I forgot to mention one of my most favorite rotary cutters, which a quilty friend bought for me. It's a green Clover 45mm cutter with a built in LED light! It's so awesome for cutting dark fabrics or when you are working after dark. I LOVE it! Another awesome cutter, also given to me by a quilty friend (I have great friends, don't I?) is the KAI cutter, which others have mentioned already. What's unique about it is the blade cover automatically opens and closes with cutting pressure on the mat or the absence of cutting pressure on the mat. You never have to open or close it at all.