OH, what a loaded question you have ask!
You will get a lot of opinions here on this, but, let me be the first.
I had ONE and only ONE. When I needed it the company, out of Fla, tried to find more reasons to NOT pay than one good reason to pay.
My Story: Had a class A with a 460 Ford engine. The oil pump failed to pump, or lubricate all of the internal lubricated parts. Since the oil pump was not listed as a covered item the company refused to pay. Next step an attorney, and he had a ball with those idiots and needless to say they did pay.
Would I buy another extended contract? NEVER!!!!!!

There may be a good company out there but I have yet to find it,and, I believe many more here feel the same way.
You may notice by my signature we have been fulltimers for about 6 years and our Newmar has been very reliable after the first 18 months. You have a good product and Newmar will help if something odd comes up. They just take care of us!!