Well based on first hand experience in NZ.
My sons Macbook died, a new mother board was needed. It was just shy of 3 years old.
Took it back into Noel Leemings, argued with them over the CGA , took them a written claim under the CGA, and then talked to Apple Singapore about it and 2 weeks later a new motherboard was fitted by the local service agents all at the cost of $0.
Noel lemmings was a **** to deal with the sales droid there was completely powerless to do anything, kept trying to get me to rings head office at my expense etc, Apple was brilliant. I got phoned updates from when the board left Singapore, when it arrived in Sydney, When it was shipped from Sydney, when it arrived in Auckland, when it arrived at my service agent, when the the job was done and again a month later to see if everything was OK. Heads and shoulders the best service I have had.
And its not the only item I have had repaired for free under the CGA, nor the only company I have claimed against. I have also helped a few friends with their claims.
Depending on the brand, how much you paid, etc computers can be up to 5 years under the CGA as a realistic expectation of life. Some stores will tell you the CGA is the same as the 12 month warranty so you should buy Applecare, I tell them they are breaking the law by giving out patently false information and they shut up quick. I would NEVER buy an extended warranty, for anything !
The CGA follows the product, so even if you buy the laptop 2nd hand and there is no physical damage (i.e. it was dropped, got wet, etc) then the next owner has exactly the same rights under the CGA as the original owner.