I use the Edge Pro "Professional" to sharpen all my knives and have found it to be awesome as it will sharpen any blade to whatever degree of sharpness you want. Very simple to use and foolproof! That being said, I have found ATS-34 to be the hardest steel I have tried to sharpen and takes the longest to do so, however, it can be sharpened to a razor edge. I prefer forged blades as they are easier to sharpen and get "scary" sharp.
My girlfriend, who had never sharpened a knife, learned how in only ten minutes or so.