As the original poster to this thread, I'm sorely tempted by the Kickstarter for this similar product.
I've used Paizo flip-mats for the past 5 or so years and while I've liked them, they definitely have some limitations (such as not being quite big enough sometimes.
So you've definitely grabbed my interest. I must say that I would prefer gridded lines to corner holes. I understand what you mean about making the acrylic tiles weaker with lines, but I would have thought some very shallow scoring wouldn't comprimise tile strength all that much.
Do you know how many tiles/sets would equate to a Paizo flip mat? Just trying to get a rough idea of how many sets I would need to cover what I think is a sufficient space.
Olaf the Stout