I have the phone in an Otterbox Defender since day one. Took out this past weekend and used it naked (the phone, not me). It was like holding onto a bar of soap. I was constantly dropping it onto the table and into my lap. Not an easy phone to hold for me. It's back in it's case now and I feel safer.
The phone, however, is very sexy when naked; it's a sharp looking phone and the screen looks much better without the clear plastic screen protector. Too bad it feels like a slippery eel.