However a glimmer of a response from Apple who seem to allow a shop a two week window for repairs before they will get actively involved in considering a possible solution: e.g. replacement.
Apple can be brilliant and then not so.
I bought two new 27" Imacs at the end of the year for our London Space. The first one arrived with Mountain Lion and when the updates appeared it was tremendous, never crashed, 100% solid and fast.
The second came with Maverick and it crashed on everything, so I wiped it reinstalled with Mountain lion and it still did the same.
Anyway, I am always afraid of version 1.0 of everything and had I not had a good experience with machine 1, would have held off on machine 2.
I guess it's all a crapshoot.
One thing I've noticed in my years of dealing with Apple is it really depends on who you get on the help line. We had one studio manager that could get a resolve from them in minutes, rather than days or weeks.
I don't know his trick other than he made a lot of notes, took everyones name and was relentless in moving up the food chain until they finally just refunded the price.
Chris, I'm curious though, why did you move to the new desktop so soon? Not that any of this is your fault because things should work as advertised, but the comparisons I've read between the Imac and the flower vase they seem to run pretty much even on most programs.
Anyway, I wish you the best.