As I was going to bed last night I finished reading and set my Kindle on my night stand but didn't quite get it all the way on. The Kindle toppled off, bounced off the base of my lamp, and landed on the floor. I picked it up and saw that the Kindle had come loose from the pins. I didn't think it was any big deal, until I tried to put it back in the case and it wouldn't fit at all.
The Kindle itself was fine, no cracks that I could see, but the post holding the bottom pin was twisted and the pin itself was bent down. After some extremely careful bending I got the pin to slide back into the Kindle but now there was a bit of wobble and movement.
I added two velcro strips to the back of the Kindle to keep it tightly bonded to the case, and it seems to be holding well with no extra jiggle.
So, be careful with your Kindle. The drop wasn't very high, and the landing wasn't too hard, but it was apparently enough. I've dropped my K1 from much higher several times without incident.