Thats a great tip..to those of us that learned to use the mat for measuring and cutting.
but truthfully,. i feel the best method of measuring and cutting, is to rely on the rulers, not the mat.
i wish i had been taught that way, i first noticed Alex Anderson using the ruler..and i was amazed.and swore i would relearn..
(that way i can use the back of the mat when it wears out!)
habits are hard to break, but when i am showing someone new how to cut, i show them the ruler method, and not to rely on the mat.