I have both the 36x24 Olfa mat and the larger Martelli mat. I use the Olfa at home and when I am traveling with DH I use the Martelli because it can be rolled up and does not warp. I really like them both but if I had to pick one over the other it would be the Martelli.....expensive but worth it for me. I have used the others that you can buy from Wal-Mart and they work well just don't last long.