I'm having a real tough time on deciding whether to get my iMac replaced or not. It will be two weeks this Thursday. On one hand, everything about it is perfect. No dead pixels and no scratches anywhere. On the other hand, there is some yellow tint on the lower part of the screen. I have AppleCare so part of me just wants to enjoy the iMac and have the screen fixed in the 3rd year if it really bothers me later on.
I was in the same boat, and I sent it back. Now I'm debating about getting another one, or waiting til Apple resolves this.
I say get rid of it. You likely won't feel better about this over time.