OK, just got back from the Apple Store after exchanging my somewhat defective MBP 13".
All I can say is "whew..". First, they took the MBP inside for about 10 minutes to look at the the problem I described. Then they came out and told me it was good to their eyes and they don't really see the problem. But as I told them, it is a problem to me and it's annoying. They agreed to exchange it (yay!!!)...but....they would have to charge me for re-stock!!! Then my face just dropped and I began to justify my replacement. Then alsmot immediately, the person I was talking to said it's no problem, the fee will be waived. OMG, what an ordeal at the Apple Store. It took 30 minutes before I can leave the store with a replacement.
And I'm happy to say, my replacement is perfect!!! You guys know your stuff, thanks for the warnings.