I got the knifeplanet.net starter set of stones a couple years ago for Christmas. Made an ENORMOUS difference in using our knives. I sharpen them about once a year or if one of them starts to feel dull. Took some practice to get the technique down though - about the fifth knife I sharpened was when it became both much sharper and took less time. Don't get frustrated by the first few attempts if they don't turn out as sharp as you wanted.