See
Here for some additional discussion on X-Warranties.
The current 3-year warranty on Alpines is a good one (some have only a year), tho the installed components (TV, fridge, furnace, water pump...) are not covered other than their manufacturer's warranties IIRC. CW offered us an extended warranty for ~$1,600/year for 5 years if we bought the warranty w/in 6 months of taking delivery & paid it continuously. I figger'd that was in the neighborhood of high, and we didn't bite.