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This is the one I have, and it's lasted me for several years with no loss in quality since the first day I've got it. I've used it on resin, plastic, and metal.
http://xuron.com/index.php/main/industrial_products/11/10

Anyway, the Xuron blades are supposed to be offset, it is designed that way to shear through the material rather than "pinch" the material you're cutting. http://xuron.com/index.php/main/faq/2