I'm a little miffed about this whole scuff thing...it's a black eye for a company who prides itself on the highest quality products. That said, I am likely not to worry too much about it, as I'll have it in a bumper for 99% of its life (I found that without something, it slides on tables too easily, and I like setting the phone on its screen (so my cat doesn't walk on it), and so I want a small lip to elevate the screen off the table.)
I have had a bumper/case on all my iPhones, and while I like the look of the bare phone, I know I pretty much will only have it bare for a few days (my bumper comes Tuesday, unfortunately).
Still...if it wears really poorly, really quickly, I will likey go for an exchange. If there's a little wear on the edges, I won't worry about it. I think if just the chamfer wears, it could look really nice after a little while, but there are now reports of the non-chamfered hard edge wearing as well, and that's just unfortunate and disappointing.
Still, it's a phone...not a Rolex.
Right now, my black 32GB is on the FedEx truck for delivery, so we'll see how it turns out.