Here is the Martelli demo video
http://www.youtube.com/watch?v=8xF3OBFIQIs
Here is their online catalog
http://www.martellicatalog.com/
I believe at Quilt shows, they combine the Mat, Cutter, and Ruler as a combo for saving money.
What is great about Martelli, is you actually use the lines on the mat for cutting, and it has a light and dark side to better view the lines based on fabric colors, as well as areas of the mat that size up the lines for needed measurements. Their ruler is non slip, has slots for cutting, the mat is indestructable (see note at bottom), their blades are titanium (I think), last forever, are sharper, and their rotary cutter is ergonomic.
At the LQS, many have used the Martelli mat with non-Martelli cutters and have cut right through the mat! It didn't heal.
So, if you are going to use Martelli cutting mats, use all Martelli notions for cutting.
I have no financial interest in this company but would love to own stock, and someday, I will buy their combo.
Diane