extended warranty service contract?

Ok, my 2013 XTS has 41000 miles on it. I've had it since new and the factory bumper to bumper warranty will be out in another 9000 miles. I will probably hit 50000 miles before the 4 years. I just got a letter from the dealer about the extended warranty offer. I usually make it a point to not buy extended warranty on anything I buy. But in this case I just might think about it. The car has been pretty reliable but with all the electronic stuff I'm not convinced of the future reliability. Any opinions?