An interesting video by Shinobu Takahashi, a Microsoft employee, demonstrated quite simply that the while the Windows Phone 7 platform is standardized, it does not necessarily mean the sensors are equal.
In this simple test of the gyroscope, a new sensor on Windows Phone 7.5 phones, the HTC Mazaa tracks the movement of the chair much better, with the triangle always returning to the same orientation.
The same can not be said of the Fujitsu IS12T, which demonstrates more lag and in the end ends up pointing in a completely different direction from which it started.
Such variation would make creating reliable Augmented Reality apps more difficult, and indicated Microsoft should spend some more time on quality control to prevent this.
Read more at Shinobuâ€™s MSDN blog here.