If ease of use is your primary concern, the Global MinoSharp Plus 3 Sharpener is the correct sharpening tool for you. The unit will sharpen most brands of knives. However, they cannot be used for serrated knives or knives sharpened on one side like the Bunmei knives. Has 3 stages: rough grit, medium grit and fine.
The large wheels make the MinoSharp Plus the most effective sharpening gadget, manual or electric, on the market.