It's a new RV that comes with 12 months warranty on the house components and standard manufacturers warranty on the chassis, correct? If you do decide to buy in, make darn sure that the extended warranty period STARTS AFTER the OEM waranties expire.
All that aside..... The chassis is standard truck components (Ford I assume). These are solidly built to last and unlikely to have any catastrophic failures that will cost you big money in repairs, as long as you maintain things.
The house components are a bit more fragile, but..... You need to balance the cost of the EW, vs likely repairs. A fridge replacement would cost you ~~$1500, but is unlikely to fail for a long time in a new rig. There's really nothing else in a class C RV that is going to cost you thousands of dollars to repair, which EW will cover. READ the contract terms VERY carefully before signing.
Lastly, YOU need to take your own financial situation into account, along with your tolerance for risk. If a $2000 repair bill is going to cause you financial problems to the point where your rig will sit in your driveway unusable, you may consider the EW. Especially if you are making a monthly loan payment on that dead rig!
As others have said, the EW companies make lots of money on these policies, because the vast majority of them don't pay out more than the premiums they take in. After all, that's why they are in business. As long as you do your due diligence and make an informed decision, you need to do what makes you comfortable!!!!!
Paul & Sandra
Plymouth, MA
2014 Heartland Cyclone 4100 King