I've a iBook G4 14" that has a faulty logic board. It was purchased in May 2006 with ext. warranty. The unit was purchased for $1649 and ext. warranty was $249. The cost of replacing the logic board is close to $900 parts/labour included at our location.
When I faxed in the quotation to the warranty company. They decided to offer a cash settlement of $946 to the customer. The owner was so glad to know she will be getting cash towards to buy a new Macbook even she has to fork out another $400.
You should buy notebook warranty from the manufacture if your laptop is over $2000.
My previous $3000+ Dell XPS M1710's video card died 2 times within 3 years.
The first one died few months after the 1 year warranty, but was covered by my master card. Then the second one died few months after 2 years.
Hard drives die too, they are not supposed to last more than 3 years nowadays.
The video card is nvidia's fault actually, but they don't admit it. They only admit the low end version that has this problem. But the fact is their high end version 7900m or 7950m GTX has this problem too.
The cost of buying the video card so I can replace it myself is over $600+. So I gave up on fixing it and bought a new laptop from alienware, which is also dell's.
So, my suggestion is if your laptop is expensive and do not have the guts and/or technical experience to open up laptops (at least 30 screws and fiercely pull fragile components apart), then you need to buy warranty, at least 3 years. You will be better off in long run.
For my Dell Work laptops, they all come with warranty. It's kind of important, since getting it replace ideally with the same model to stay compatible is the goal.
However, I don't recommned buying extended warranty other than using a credit card which comes with some sort of extented warranty.
Computers world is changing fast, and having 2 years of warranty would pretty much cover by your original manu. warranty and credit card extended warranty. Once it pass the 2 years mark, your computer is probably old enough that if it breaks, you may as well get a new one.
I currenlty have 4 sony laptops, and haven't had any issues. And I manage about 40+ work Dell laptops. They are anywhere from 3 - 1 years old. The only few problems I have are asl follow: Bad keyboard (end users abusing the keyboard), broken HD on a 2.5 years old HD
I would say, if your laptop is made by Toshiba, Sony and Apple, get the warranty. Toshiba is common to have motherboard and power related issues. Sony is getting worst these days as the quality of the new VAIOs are lowered to meet the low price, the parts are also crazy expensive (100+ for a fan+heatsink module). Apples are reliable due to unibody, but if something on the keyboard is wrong, the unibody top case cost over $250.
I repair HP, Sony, Toshiba, Apple daily.. I have just seen all problems, and most problems are due to user created problems.