You can get great results building models in FoamCore, as Eric Strebel illustrated in a couple of tutorials. If that or corrugated cardboard is your material of choice, and if you're super-anal about your models, you could take them to the next level if you had some means of cutting the edges at precise angles.
That's where this Perfect Cut tool comes in. It uses your standard snap-off utility knife blades, and has a little jig that lets you dial in the angle of cut:
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At $89 bucks it ain't exactly cheap, but at least 965 people don't care. That's the amount of folks who pledged for one on Kickstarter. At press time the campaign had attracted $96,863 towards a $50,000 goal, with 37 days left to pledge.