I used to work for Kemper Insurance, which was (is) a major underwriter for a lot of the warranty companies out there. Based on my exposure to the industry I would offer the following advice:
1) Never buy a 3rd party warranty of any kind for any product. No exceptions.
2) Long term, you will save money by self-insuring. Put your warranty money in some sort of fixed return account and draw on it for repairs as needed.
3) If you absolutely insist on buying a warranty, buy one that is through and backed by the original manufacturer. Look for an exclusionary warranty vs inclusionary. Exclusionary means everything is covered that is NOT specifically listed. Inclusionary means the only things covered are those specifically listed.
4) Understand completely your maintenance and reporting requirements to keep coverage in effect. They have an entire legal team devoted to nothing but tilting the contract in their favor and legally denying claims. Does your warranty force you to agree to arbitration only? Arbitration is entirely tilted in the favor of the company vs the individual. Prevailing in a dispute in arbitration is both time consuming and very unlikely to be successful.
5) "Peace of mind" is an often cited reason to buy a warranty, but is that peace of mind false? Are you *sure* they'll pay for any issues? Better luck with the OEM, but far from the guarantee you'd like to think. Can they get the parts? Will they priortize you? Use OEM and new components? Peace of mind is ready cash that you can take care of a problem on your own on your terms with your service provider of choice using your choice of parts, etc.