As a general rule, I never fall for the extended warranty thing.  One exception was when I purchased a Pocket PC handheld.  I went for the extended warranty...glad I did.  It died on me several months later and was replaced with an identical model, which died a few months later, which was replaced with a Palm Pilot, which died months later, which was replaced by a Sony Clie' which is, after 2 years, still alive and well!  The warranty provided peace of mind and simple exchange at the store with no questions asked.  In this case, I'm glad I bought it.
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Tim Schaeffer
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YAMAHA CVP-509 / Korg Pa300