I also recommend the Martelli rotary cutter. I have tendinitis and RA. I could cut for about 5 minutes before the Martelli. I no longer have the pain radiating up my arm or my hand going to sleep. My hand does ache but I can use it for an hour before I have to let it rest. Usually in an hour I have cut enough to sew awhile, iron seams and put a couple of blocks together before I need to cut again. It did take a little getting use to. I recommend watching the video on the website. They show you how to hold it, unlock and lock it and where to put your thumb and first finger. I love mine. I showed it to several ladies in my sewing ministry with the same kind of hand problems. At least one of them has ordered one.