I use metal rulers all the time for some things so yes they are great with a rotary cutter. But you all need to look further into that website, I see where they will cut to size a see thru cutting mat that I think is great because if you have an odd sized table it would be perfect to have a mat to cover it so you could cut any where on it without having to move your mat around like I have to all the time.
With a full sized cutting surface, I can just throw it on the table and cut no matter where I'm standing. I really love that idea.
Oh my, my mind is flying with this. Wouldn't it be great to have a table for cutting with a glass insert for a light box all in one? Using their translucent cutting mat would make it possible. Boy have I got some redesigning to do!