I may be a bit biased...........
I do not EVER buy extended warranties on major appliances, or electronics.
The maintenance guidelines that are required to be performed, at the owners expense, MUST be done or the whole thing in null and void.
Take a look at the fine print on the 3 year warranty. It states that the refer has to be tested, the coils cleaned and inspected once a year by a Dometic authorized tech. Miss the first year, warranty goes poof! At least on an auto, if you can prove you did the maint. you are still covered.
My nightmare scenario is that they will want to remove the refer to get to the coils to inspect and clean, I have a more severe curve to the inner wall than the newer coaches. You cannot see the coils from the door. This would require 7-10 hours to remove and replace all the interior components to visually inspect the coils. I don't trust many dealers to do it and not damage something. Nothing in my coach interior is available as a replacement part, so when they bust something I am SOL. I won't even get into the local dealer and their service department nightmare stories.
Don't buy it.
WBCCI #5501 AIR # 49
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato