I've noticed on mine on the chrome rim, that edge nearest the screen, on the top left hand corner is jagged and not smooth. It's not really novicable from a far, but you can see it and feel it. It's especially novicable when wiping the phone with the supplied cloth.
Will I be ok for a replacement? I know it's quite nitpicky and not a huge flaw, but I'm a bit of a perfectionist and I just know it's going to annoy me for 18 months! I got it from an Apple Store in the UK. I'm really hoping that they'll be ok with a swap and not call me a freak for being bothered about what could be seen to some as a tiny minor imperfection.