I bought the rotary cutter because retracts from his hand lay the blade and you can not cut accidentally. By serving red button, this function can be turned off as well as you need it straight. In addition, the Schreiderad can be easily converted for left-handers, so you can also see where to long cuts. I use the rotary cutter with a self-healing mat, he has remained always sharp and cuts multiple layers of fabric with little effort. Conclusions: thoroughly recommended, I am heavily inspired!