Overall happy with the desired out come in use of this product. I wanted to do a mat board outline for framing the art work.
Do not follow the How-To instructions on the back cover of the product, it will produce a beveled cut opposite to the desired outcome e.g. per instructions you have to mark your cut lines on the back of the mat board and make the cuts on the back, but then the bevel cut will be on the back side of the desired finished front.
So to do the bevel cuts right you have to mark the cut lines in the front i.e. on the desired finish front side and obviously you don't want to dirty the front hence you have to ensure that your line markings are lightly done and cover the front side of matt with clean butter paper or some clean paper on which you will slide the NT cutter. Don't worry too much about the lines, since the cuts are beveled, the line goes on the side of the mat board which is discarded. Your finished mat board won't have the lines.
The end finish was a very clean 10.5" long cut, the blade is good. I went through the 1/16th inch thick mat board in one slide pausing half-way readjusting my grip and continuing to the end, multiple slides back and forth was a bad idea as it was causing shreds of cuts if your motion went slightly off your line.
It required a steady firm hand and adequate pressure to do the cuts right. The red plastic base edge which slides against your ruler could be made better, it had minor imperfections.