My first Microplane and my favorite to this day is the one in the middle of the picture. Click on the picture to see a very large view. Zesting a lemon is as easy as grating parmesan. I've probably had it for ten years and it's gone through the dishwasher innumerable times without dulling at all.
If I could only have one Microplane, the middle one is the one I'd choose. The topmost Microplane in the picture makes small strips of cheese great for topping salads. The little one at the bottom is pretty good on nutmeg.