I'd disagree with the iPhone comment, actually. I've owned an iPhone 3G, 3GS and 4, and have replaced each of them at least twice due to various issues (buttons sticking/breaking, a vibrator motor dying, battery life issues, camera issues, etc).
Because of this, when my and my wife's iPhone 4's were about to hit the 1-year mark, I decided to add a year of AppleCare.
Not sure where you live, but here in the UK the Sale of Goods Act covers manufacturing defects for a lot longer than 1 year. All manufacturers and retailers are really extracting the michael when it comes to the sale of these extended warrantees. And in many cases retailers have been selling these add-on covers to gullible consumers unnecessarily.
Accidental damage aside, all electrical and electronic devices should last 3 years. If not, why would we buy them? And what manufacturer worth considering would market them?
It's sometimes very difficult indeed to get the retailer to understand their responsibilities under the law, but well written letters backed by the correct legislation works eventually.
So, if a vibrator motor stops working on an iPhone that's less than 3 years old, it's Apple's responsibility to replace it, not yours - no matter what the retailer or Apple say. And when they refer you to the wording of their terms and conditions, in the UK at least, refer THEM to the Sale of Goods Act.
Batteries on iPhones are meant to last 1000 cycles, which is going to be something like 3 years. But what does it cost to replace the battery in an iPhone?
Apple's disclaimer is also worth reading:
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1. iPhone comes with 90 days of technical support. AppleCare Protection Plan benefits are in addition to any legal rights provided by consumer protection laws in your jurisdiction.
2. Service coverage may be subject to certain restrictions. Service coverage is available for battery depletion of 50 percent or more from the original specification. Products returned for service may be repaired or replaced with parts equivalent to new in performance and reliability. This plan extends your service coverage to two years from the date of your iPhone purchase. The plan must be purchased while your iPhone is still under its original one-year warranty.
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This is a 12 month extended warranty and little more. It's not 2 years cover at all. And it confers no more cover for manufacturing defects than the law already allows. So this is 12 month cover for accidental damage only - plus some phone support. I would argue any good manufacturer or retailer should provide that for free anyway.