Been naked since the day it was born. Kept my 900 naked as well, which was dropped several times. Worst that ever happened to the 900 was some scratching on the metal plate surrounding the camera on back... they seem to have something stronger on the 920 because there are no scratches so far.
Honestly I don't get why people bumper their phones. It's like putting plastic on your sofa or your rug - if you never enjoy it, why'd you buy it? The iPhone looks really nice out of the box, but I have NEVER seen one in public: all I see are ugly cases. My friends tell me "man your phone is huge!" then they set their iPhone next to it, and with the bumpers it's thicker and wider than my "huge" phone.
