Just an update since I got my KO-WSKT a couple weeks ago. Holy crap I love this thing!!!! I went on a knife sharpening binge! I can now shave with every single knife in the house, from paring knives to cleavers, to bush crafting knives. It's amazing.
First off, it allows for incredible consistency. you get an edge that esthetically is just gorgeous. A mirror polish and a real work of art. More importantly, you can get some serious sliciness out of the knives!
Like others, i have found that I rarely use the extra course belt. I only use it when doing a serious job from scratch (had a friend's field knife that he hasn't sharpened in 4 years. It has nicks, chips, and was blunt as all get out. It was a fantastic candidate for the extra course belt). I also find a couple passes on it is great when working with more abrasion resistant steels. Something tells me if I get a BK24, I'll give it a few passes on the extra course first!
When people tell you to use a practice knife first, they are totally right. I used a knife that a buddy gave me. It was a garbage knife from Harbor Frieght. Perfect candidate to learn the ins and outs. Turned it into a slight recurve by accident. but by the time i hit my good knives, i was set!!!
All in all, i can't recommend it highly enough.