Here is a video of the mishaps / crashes / hard landings it's survived intact.
http://www.youtube.com/watch?v=IQx9eHrfDF4
Seems like there might be some kind of 'slipper' on the blades themselves, in order to prevent damage, not that I recommend getting them caught in something like I did in this video.

And a nearly-unedited full runtime video (roughly 9 minutes).
http://www.youtube.com/watch?v=3zw1T6JfhMc