That I've been using the same Summa D120 pre- OPOS cutter for nearly 20 years says everything you need to know. It is not in the slightest an exaggeration to say that Summa (AirMark) designs and builds the best engineered plotters in the world, and has the best customer support on the planet, thank you for validating my decision to use Summa so many years ago, there were many choices then.. to me, there are no others today.