I also have always used Olfa but I now use a 28mm for most of my cutting. I tried the Clover but it is difficult to change blades and it still doesn't work correctly. I prefer Omnigrid mats. They are much thicker and have a gray back that I can also cut on. I was very disappointed with the quality of the last Olfa mat I bought. JAF is only offering the Omnigrid mats online. Be careful NOT to order a mat online during the summer heat. They will most lucky arrive warp since they have been in the delivery truck all day.