I have the KO Worksharp too, but I don't have the blade grinding attachment that
SmokinAl
mentioned. They have a short learning curve and I've been very satisified with mine. The company has good instructional videos, most from one gentleman that does a good job explaining the technique. The more you use it, the easier it is to develop the proper grip, technique and travel speed as you draw the blade toward you. Be aware that there are some negative videos out there too, knocking the angle adjustment and claiming the bevel angles can come out unequal, but I use a magic marker on the bevel, and only use the Worksharp setting as a general reference point.
I do own an EdgePro Professional, which uses the water stones and tape strips. I use it on certain knives when someone wants a polished edge, or a low angle scary sharp edge. These sharpeners are pricy but I got an amazing deal on mine as it was a distributor demo kit, and has a scissor attachment. If I had to pay retail I might not purchase this sharpener.