Umm.....my MIL and I have had our Olfa mats for 25+ years. One of my DILs has that one now and I have a 24"x36" in my sewing room. None of mine have marks in them. I didn't like the red ones, whatever brand they are. I felt like fabric slid too much on them.
I wish I could find another Olfa ruler like the one I bought with the mat but 36" long. I truly don't intend to ever replace my mats. I assumed they were a once in a life time purchase.