Love them. I bought my first one when they were called Rule Steady. I use the Rule Steady and SlideLock on top of my ruler. Much easier for me. And I don't have to worry about the rotary slipping and cutting my hand. Everyone that cuts in my sewing room with a rotary has to use it or the cut resistant glove. No exceptions. Same at our guild. Use the safety tool or don't use the rotary cutter. Our guild was almost sued when a member cut her hand because we had no safety tools available. Said it wasn't personal just insurance.