I just took the laptop I purchased into Apple Store yesterday -
they ran a whole bunch of tests to make sure all the hw was working fine
(the battery was at 93%!) before downloading maverick for me - I had
purchased Snow Leopard (online from the apple store for $20, free shipping!)
as that is the last version that could be bought on a CD.
I may not have needed it; when I went to the applestore, they didn't even ask
about that (though the disk was still in the drive).
I left it at the store, as it would take a couple of hours to download (I was told)
maverick.
Before going to the store, I called Apple Support to see if I could do it from
home. The laptop even had some AppleCare time left on it! But since I purchased
SnowLeopard, that gets me 90 days of AppleCare support. Unfortunately, was
unable to load the OS from home, so he sent me to the apple store (and even made
the appt for me).
The laptop I got had some minor scratches, but I was impressed that the battery
was in nearly new state.