I'm still using my original Olfa mat - it is at least 25 years old. But I have not been using it non-stop. I have 2 Olfa mats - a smaller one that is now in my traveling bag, and a friend gave me her 36 x 36 white mat that gets used for cutting very long pieces or trimming a quilt. I also have a June Taylor ironing/cutting mat that is getting towards the end of its usefulness. And, a few years ago I was told at an Olfa Rep that if you soak them for 15 minutes in warm water they will last longer, so I started doing that.