I wont dare use this phone without a case, and I wont let my wife even take hers out of the box until the cases come.
Knowing her, she'll have the screen cracked before we even get it activated.
This phone seriously is like a piece of fine jewelry: this diamond chamfered edges, the smooth glass and metal intertwined... I do hate to cover it up but just cant risk a cracked screen, even with the Nexus Protect on both our devices. In "safe" environments (on the couch, in bed, etc) I'll take the case off and marvel...
I drop my phone about once ever two months in taking kids out of the car, it falls out of a pair of shorts with not deep enough pockets, etc. Just cant risk it.