Wow had to turn it off today after trying for 3 days to get it consistent. Made sure to recalibrate probably a dozen times in different light conditions and it is simply not consistent enough to use in the real world. It requires perfect lighting and perfect device placement. I even tried the trick to look directly at the microsoft logo. It simply needs to work if you hold the phone up and look at it. If it can't be better adjusted after beta it will not be much use.