At this point, the head tracking is a gimmick. It's not something people chose or switch ecosystems for. Might attract truly new smartphone users, but isn't a "

At this point, the head tracking is a gimmick. It's not something people chose or switch ecosystems for. Might attract truly new smartphone users, but isn't a "killer feature". Apple already uses 6D accelerometer applicable to much of what the Fire's head tracker will be used for.