We have the extended warranty on our 04 3670 and I am glad we have it. It is good until 2011. So far they have replaced the grey tank and the Quest receiver. When we get back home the Black and the other Grey tank will be replaced as they have leaks when they are full. The water heater has been acting up so they will be looking at it also.
I think the decision on whether to get the extended warranty depends on how long you are going to have the unit until you trade again. I don't expect we will be trading ours until after 2011.
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