I wonder why Sony did not include an electronic gyro and accelerometer in the unit. It would have allowed 1:1 headtracking. Could imagine though that they've extensively tried and tested this.
Perhaps a reason why they didn't is that the optics only work properly when all is precisely in place and that head movements would lead to too much position shift? Or did they find it would lead to motion sickness?
Anyway, looking forward to more reports from early adopters, such as this one:
http://widescreengamingforum.com/for...-t1-hmd-head-m
MAC