got my i7 today....
opened it up, set it up on my desk, removed the protective sheets from the screen and found the most wonderful computer complete with a SCRATCH ON THE SCREEN.


so it gets to go back tomorrow. wonder how long i'll have to wait for the new one to arrive...
just my luck
That's almost as bad as getting one DOA.
My first 24" dual 3.06 was bad coming out of the box. Wouldn't boot.
Called AppleCare, and they said to box it up and return it asap, then give them a call as soon as I had the tracking #.
They didn't even wait to receive the old unit back, they shipped the new one as soon as I gave them the tracking number, and I had the new one set up and running within 48hrs.
After a year of heavy use, the new 3.06 went up in flames, almost literally. Smoked the power supply, and a whole slew of internal components after a fan failed.
Called up AppleCare again, and they sent a rep to my place twice attempting to make repairs, then decided to replace the unit. I did upgrade to the i7, and I should receive it Wednesday morning. That's about three weeks after returning the last one.
So based on my experience, you should have your new one in between 48hrs, and three weeks.