My MBP fell off my chair (maybe 18"?) onto a wooden floor and the screen shattered. Not sure what it cost my employer to replace that, but I am extremly unimpressed w/ the durability of these things. It was certainly inconvenient for me to have to switch computers for a couple weekswhile mine was being repaired.
I mean that's the nature of a unibody machine with edge to edge glass sandwiched in.
The main body is amazingly sturdy. I've crushed mine behind a power seat with enough force to bend the aluminum but the machine kept on bar some faint stuck pixels in the imprint of the keyboard.
But drop it the wrong way and the aluminum lip will give way immediately, and it's no different than if you dropped a thin pane of glass with no protection right on its edge.
For what it is I say the Macbook is very study. It's never going to be a rugged book with the current design, but I haven't had many "ultrabook-style" machines that were as tough as a Macbook.
