Extended warranties are an awesome money maker for the sellers, but a horrible investment.
Your drivetrain is covered by Nissan for 5/60,000. Extended warranty would only kick in after that time. So you are buying
insurance now for $1-2K in the hopes that something will go wrong with your car in 5 years that will cost MORE than the $1-2K (+interest). However, if there really are catastrophic problems with the CVT, we will see them as Muranos age (maybe not yours, but on average we'll see the reliability issues in Consumer Reports and similar places). If the car looks like it's going to be a lemon, say by the time you've owned it for 4 years, you can then trade it and use the money you saved on the EW (+interest you earned on it in 4 years) on a new car instead of an old one.
"Electrical gadgets" are covered by the 3/36. The failure rate of solid state components is bell shaped. They either fail very early (within a few months) or very late (10 years). Moving parts like power windows and mirrors, CD players, leveling motors in your HIDs fail based on wear... but are they really worth a warranty of $1-2K that only kicks in after 3 years?
Hmmm... I thinking about it, after seeing that poor guy's thread on his shredded CVT and his problems with the dealer fixing it.
I really feel for him, and I don't want to find myself in that situation.
Just curious here, but suppose you have an EW, and you have a powertrain problem AFTER your factory Nissan warranty expires. Where will you take it to get it fixed? The same problems apply.