The purpose of this feature for me would be if I set it to portrait and then move the mount, or remove it in order to get a better look, or in most cases when I have it in my hand as a passenger... my movements do not cause it to rotate...

In some cases this causes it to rotates twice, once to the wrong direction and the once again to the orientation you prefer to view it in.

This however is not such a big deal now as it appears less sensitive and is quicker to respond. In the first build I used there was a noticeable lag and often I would give up and rotate the device to the way it is displayed but because of the lag, it would catch up with my first orientation I would rotate back and the lag would send it the other way.

This would go on for awhile like the dance you sometimes get into when some one is exiting a door way at the same time you are entering it and no one can decide what side they want to be on.

..but again, this lag is not as noticeable now.