If you buy one, I highly recommend the often-overlooked end trimmer accessory.
Since it is mounted on the machine and has a pneumatic clamp, it is quite accurate and can be more convenient than trimming on a bench-mounted cutter a few steps away. It will trim foam board and fluted polypropylene (Coroplast) up to 3/16" thick, as well. For end trimmer blades, the ones we take out of the cutting heads serve double duty.
If you wish, the machine will size your mats automatically, but after the cutting operations, before stowing the leftover board pieces, you would probably want to trim off those thin perimeter scraps outlining the mat's size, anyway. Pre-sizing your mats on the end trimmer is a fast task that can extend the life of the machine by reducing the cutting miles, maybe as much as 50%. For my money, that's a good buy.