If you’re looking for a knife sharpener, you’d be hard pressed to do better than the Spyderco Triangle Sharpmaker. It will get your knife (or screwdriver, fish hook, or anything else with an edge) scary sharp. You can even sharpen serrated blades with it. I have even heard that you can use the Sharpmaker to sharpen the serrations out of a serrated knife! Spyderco is also a great company that really makes fantastic knives and stands by their products.
I’d say he sounds like a shill, except that’s pretty much the same thing I keep hearing about the Spyderco sharpener from other sources, too. The Triange Sharpmaker is $75 available directly from the company.
Product Page [SpyderCo.com]