Chubulor. there's two displays, and only one accelometr, so in order to properly rotate the screen you need to know layout of displays (are they flipped, closed, back2back, reverse-flipping e.t.c.) it's not a real problem, but makes things a little harder.
On other hand, I personally dislike autorotation, 'cos for example sometime you need to view an image which is vertical from horisontal point of view. Or some false positive rotation which is also not a problem, but it takes time to rotate in normal position.