I have a Quilter's Select cutting mat, I had a Fiskar's one before that, I've never had an Olfa.
I love the mat, it's super thick, double sided, numbers go in both directions, there are definitely 1/2" markings but they don't stand out super well if that helps you. I have wrist issues so I either use my die cutter or a 3lb hand weight on top of my ruler to help with cutting.