I had my doubts after reading some of the other reviews but I could NOT be happier with it. I think the key is to take very well lit photos. Although I didn't calibrate mine, it made no difference. I still get cuts exactly where I want them and I even managed to take the mat out, found that it wasn't cut completely because one piece of cardboard was thicker than the others, and it had no double lines pierced again! I'm in love.
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