Fluorescent lighting gives it a fit. Sometimes it comes out too blue shifted, so you have to add yellow to even it out. Or if it's incandescent lighting, it can turn out too yellow, and the reverse applies. Don't use the camera at night...
Battery life has been absolutely great for me... when I'm not in Developer's Mode. Once I did that, battery life went to absolute ****. And talking about battery life, what kind of damn car charger do I need!? 2.1 amp is enough to charge an iPad. But not enough for the N9? What the hell!? I'm honestly disliking that. Immensely.