Today is the first time that I've had my iPhone 4S out of a case since the day I bought it. This didn't happen by choice, it happened because my Mophie power charging case supply literally fell apart last night when I plugged it in.
Holding the iPhone with no case reminded me of why I bought it in the first place -- how amazing the design of the iPhone 4 series was and remains to be. I had become so used to such a large case on the phone that I wasn't used to it easily slipping into a pocket; I wasn't used to how easy it is to type on the screen without a heavy plastic edge blocking the typing surface.
I have to be honest: it's hard to want to go back. Yes, I had to already charge the phone once today as it drained down to 30% battery halfway through the day. But it's still hard to feel like I should cover it back up again or make it any more bulky than it was originally designed to be.
So, for now the iPhone remains unprotected and without spare battery capacity, but man it's nice to look at and use it.