I got one of the Micromark Choppers- best twenty bucks I ever spent. It can churn out piles of accurately sized styrene bits in minutes. Totally relieves the sort of job that used to take hours and had a high "dud" factor. Drawback: the razor blade will track slightly (parallel to the swing arm) if the material you are cutting is thicker than 1/8th of a inch. Otherwise its a great little tool.
