I've been using my two Dritz 36" x 36" white mats for over 30 years, sometimes both at once next to each other on my dining table and sometimes one gets far more use than the other. I do have a couple of the green Olfa's, but even though I've had them just as long I've only used them to take to classes. If the two Dritz mats ever die, I have no idea what I'll do.