The Silhouette SD is just the newest version of the Craft Robo. They both run the same software. I have the SD and love it. Havn't had many problems with it at all. And Calladar, as for the blades dulling, I suggest folding up a piece of foil so its about 5 layers thick, then pull your blade out of the machine and run it across that a few times. I've been using this little trick to keep my blade going strong for well over 350 sheets of cardstock thus far. No true degredation that I can see so far.