I know that may sound surprising, but I've found it useful for all sorts of things, including grating a tiny bit of ginger root. I have used my zester for 7 years now, and there isn't a single problem with it. It's sharp as can be has no pitting, has no rust... it's stellar. I've zested many lemons, limes, oranges, and used it for grating, and it's never disappointed. I must say that it is one of my favourite small purchases for the kitchen. The quality doesn't disappoint.
Disclaimer: All opinions are my own and may be different from those of your own. Thoughts Of Fluff was not reimbursed for this post.