my 24 inch iMac overheated and killed the logic board after 4 months. took 7 SEVEN long weeks to repair at Cancom in Edinburgh Scotland (AppleCare? NEVER again)
i was told the 24 is too big and there were a dozen others in the shop.
beware when buying. doesnt happen to all of them but it is happening
You realize that this is anecdotal and unsupported evidence, right?
Here, let's try this;
My 24" iMac, purchased in April 2009 is over six months old and is running great, therefore I think all iMacs work great and no problems to speak of!