Extended Warranty or Warranties which is best?

[ba999]

I just purchased a 2013 S with a PDK and only 1,200 miles on it so it was not even broken in. I have the remainder of 3 years on the Porsche warranty, but I am looking at purchasing an extended warranty to add an additional 4 years on. I have researched all to include:
Mercury, Warranty Direct, Fidelity, Endurance, etc.
So far only Endurance looks acceptable. I understand that from reading many different forums to include Porsche and BMW, most extended warranties come with their horror stories and the battles they have fighting with these companies. Endurance seems to have the best coverage for the price, but it does comes with stipulation they can use OEM, non-OEM or used parts.

Does anyone (not to include sellers of warranties) recommend any of these or others?

Thanks!