I've heard people here talk about going to mats as weather gets colder, but this is the first time I've seen one in pictures. In my mind, i had pictures something like Astroturf, not the little plastic circular fingers sticking up the way they appear. I also never imagined they were that small, but it makes a lot of sense.
I can see in some cases, using the mat would greatly improve your lie, (like the hillside rough shot in the video), but the benefits of protecting the course far outweigh anything like that.
Here in Miami, we don't have a winter by the stretch of anyone's imagination, but this time of year through the end of December, we get a lot of rain and it can leave the course in a condition where mats would be beneficial. I wonder if people would return them if the course gave them out to be used?