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The real benefit of the 3 year option is that it's tied to the device and will transfer with it if you sell it while still under Warranty.

That peace of mind is a very appealing thing to have in the resale market.
I tend to buy most of my Apple gear via Amazon, since there's usually a discount. With laptops though, I don't want to be at the mercy of Amazon support, so usually purchase Applecare as well so I can go direct to Apple.

Works out quite nicely, as the £200 saving from Amazon on the laptop purchase has almost paid for the 3 years of Applecare!
 
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