Does anyone have one of these? It says they are 3 times thicker than Olfa and are self-healing. I am looking for a large 36x 60 mat and saw these. I also was considering buying 3 smaller mats and duct tapiing them together on the back to make one large one. I had done that with a couple of smaller mats and it worked okay, but would be nice to have the measurment markings be from 1 to 60 rather than 3 separate 1 to 24.