I have one DMT Diamond Fine stone. It is perforated (polka-dotted). I'm going to be replacing it with the Dia-Sharp continuous surfaces. I've come to notice that my edge towards the tang has a "wavy" pattern when I look at it under the light. And I was wondering why that part was so dull while the middle up to the tip were shaving-sharp. The wavy pattern is exactly the part where the dots are on the sharpener, so that means that that part of my knife hasn't been getting sharpened as much as the rest of the edge!
Some people claim that the dots help because it'll hold the dust so that it doesn't get your edge. I'm willing to get some of that with the continuous surface if it means I can sharpen the base of my edge...
So personally, I think I'm gonna like the continuous surface better.