Originally Posted by khalleron
It's physics - a hinge creates a stress point that a metal body can stand up to, but a plastic body can't.
It isn't so much the hinge, but rather that it attached at certain points to keep things rigid without encasing the whole device. The Nook STR took this approach, but poorly. The Nook tended to flop around in the cover due to having two flimsy attach points.
The best thing about the earlier Sony cases was the semi-intangibles. In the cover it felt a bit like a quality notebook. It sat well in the hand. The T1 feels like a device in a Chinese-made case. It has a lot of the same qualities that made me cringe at most (but not all) of the Nook cases. It works, but lacks the sort of quality that helped trick my brain into accepting it as a book replacement.