Works pretty well, but so does Microsoft's Translation app for Windows Phone. Having used Microsoft's app for 2 years now, I am really wondering what took Google so long. Google's app offers coloring of the translation and a way more languages. But in the end, it's as fast and reliable as Microsoft's solution on my devices..
For those wondering, the app is called "Translator". I've also found the translation to be pretty good, though it tends to trip when it comes to handwriting.
