There's not much bad to say about the Microplane series of graters. They perform a job, and a bit more, and do it very well.
The grater/zester can also be used for different things, but the cover lists its potential well. You can use it to grind down hard nuts, powder dark chocolate, grate parmigiana finely, zest citrus, or any other application you could think of. I use it for fresh nutmeg nuts.
I've seen Microplane products be used bi-weekly for 5-6 years without losing sharpness, which is a testament to the steel they use in their products. Make sure you hand wash with mild detergent and a non-abrasive pad as soon as you use it, and you'll have a lasting tool in your kitchen.
As a benefit, these even come with a plastic cover to protect the blade when you don't use it. Just press on the sides of the plastic to push it back on.