There's a chefs choice manual Asian sharpener as well called chefs choice Pronto 463 Asian sharpener. I have it. It works reasonably well for people who don't want the hassle of using stones.
There's a video of it comparing it with several other sharpeners.. They dulled Masamoto vg knives and resharpened them.
Edit: sorry you were asking about a sharpener in general. The 20 degree equivalent of the Asia sharpener is the Pronto 464. I've tried that too and it works pretty good for a pull through.