Fantastic! Mine were completely accurate, they even recut when they weren't accurate the first time. Not a problem at all.
I've also been making diaper bags, big tote bags with an acrylic insert to stabilize the bottom (instead of cardboard, which could get wet and icky). I saw Clothilde had the inserts for $7.95 in today's catalog, Lowe's will cut them also! 3 for about $4. Much better buy, and now a washable and sturdy bottom to the bag.
I love this! I wish I had thought of it earlier.