I have an olfa rotary cutter which is years old and the basic model. I use it every day and it is as efficient now as it was when new. (Dozens of new blades in that time). The point I make is that this model can be used by right or left handed people as I am one of the lucky ones who can use either hand - and I do. It does not seem to matter which hand is used. Incidently this board is fabulous, I have been quilting for many years but have picked up lots of new ideas from here. Thank you all for your input. Anne