I have the Olfa ergonomic one and love it. I've used other brands but don't like them as well. I have a friend and a daughter-in-law who didn't like using rotary cutters and I found that they were both trying to use more of a saw like motion of rolling it back and forth. When I showed them that one forward swipe using the ruler as a guide worked they were amazed. Also if you have more than one blade in them they won't work well. Sometimes the blades stick together when you're changing them. Rotary cutters need to be used with a ruler to get a good straight line. I can see where using them without a ruler would be difficult.