I bought a Cutco Fillet Knife because of a thread like this several years ago and liked it so much I bought 3 more in case they ever go out of business..
I have the Chefs Choice 320. Best sharpener I've ever used!! Like ptmike says, drag the blade along slowwww.. I had messed up a bunch of knives that I brought back to life with it. If you have a dull blade with the wrong sharpening angle it can take a 1/2 hr or more to bring it back so don't get discouraged if you don't see an instant improvement!! The key is a slowwww draw, but once ya got it right a couple of passes is all it will ever take again.
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