Is the failed device something you actually use? Do you want to go/ can you live without it for 3 months?
Save the cost of the extended warranty and just buy a better/newer replacement for immediate use on the extremely rare occasions where the warranties might actuallly be used.
I didn't purchase the warranty above myself and in fact I've only ever bought one which I was delighted with (even if I never use it). From a repair/refurbishment center for Sony they offered a 5 year extended warranty on my PS3, the $50 extended warranty also included 3 brand new games (from a choice of around 50, I took Drake3 and GoW3 plus something else) and a second brand new controller.
Most extended warranties suck and are just a very nice extra profit for the store, the only time I've ever personally seen one used the experience was so slow I would much rather not have had the warranty at all, I felt obliged to make use of it when it would have been better to just replace the device.