So I've had my pixel from launch and there's one small thing that's driving me insane. The abundance of hairline scratches on my fingerprint sensor (first world problem I know) the scanner still works just as great as it did when I got it with the exception of all the scratches. Meanwhile the larger window of glass on the back is in damn near perfect condition. It's been In a case constantly. How can just the sensor be scratching, is it made of a different type of glass? And how is everyone else's holding up?