I had this on my previous RV. "Incentive" from the dealer so didn't cost me anything initially. The only thing I had to do to keep it in force was have an annual service inspection. Cost at my dealer was about $100 plus any supplies if they used any. Could use any dealer I wanted as long as they checked all the items required. Did not have to have it winterized by them. You just mail the service invoice to the insurance co every year to verify that it was done.
For the consumer - I think it just depends on what type of owner you are. If you have the time and you enjoy working and maintaining your RV, it probably won't mean much to you. If you're the type thats not quite as skilled or you usually take your RV to the dealership for service anyway, it can be a good deal.
For the dealer - it's genius! It's gets you into a dealership at least once a year. And what do you do while you're there? At the very least you look around the parts dept and find something you need. If you're like me you also look at the newer models.
I traded that Rv after about 3 years so I never had to make a claim against the warranty so I don't know how that works. Bottom line - it's not something I would pay for, but if the dealer wants to give it to me, I would probably make the effort to use it again.