I am far from an expert knife sharpener. I bought the Ken Onion several years ago and it does a credible job for what little I know about knife sharpening but, to me, it is cumbersome because of needing to change sharpening bands in order to progress throughout the various sharpening stages. Then, 6 months ago, I bought the Chef's Choice 130. I LOVE it; it is simple to use, sharpens quickly, and delivers a better edge than what I've ever had.
BFletcher, my experience is just about the opposite. Over the years, I've tried a couple of difference Chef's Choice sharpeners and was never satisfied with the edge (or how the cheap one would not sharpen back to the bolster.) I bought a Work Sharp a few years ago, and I can just about put a shaving edge on a bowling ball.