We have the Forever warranty on our 2018 3731FL. Cost is 149 a year and is mostly inspecting the roof and fixing any potential leak issues, inspect and lube the axels and annual DMV inspection. I just need to be within a window plus or minus 30 days of purchase and can be done by any certified tech. So far in two years I have replaced the microwave twice and the outside shower (that I let freeze) and no hesitation on the dealers part. The main reason I got the warranty was for the residential refer since I felt they were a bit untested over time and was concerned about bouncing around on the road.
I think a lot of satisfaction is dependent on the dealer. My dealer is top notch for service and is only a half hour away. That makes all the difference in the world. I'm happy with this warranty but it's certainly not for everyone. It's like do I keep mowing my lawn or hire the lawncare guy. At this point I still prefer to do it myself, but I'm starting to think it may be time to let someone else do it. I also pay for roadside service and though I've only used it twice over the years, those two times make all the premiums worth it.
BTW, I once had a roofing contractor tell me their supplier's lifetime warranty was for the expected life of the roof, not my life.