Fingers crossed for both of us (and anyone else still waiting), having has issued with both my 1st Gen MacBook Air (4 replacements later) and the 24" iMac top spec from last gen (3 replacements then Apple refused to exchange anymore so sent it back under the 14 days) I don't have a lot of faith left in getting a 100% spot on machine tomorrow. Hope to be proved wrong!
You have had SEVEN replacements with Apple? If this happened to me, I'd never do business with such a company!