We too were offered an "extended" warrantee with our recently purchased 2010 8315BSS for around the same price. After hemming and hawing, we declined. Lo and behold - dealer sales manager almost immediately found a way to reduce the price by $500.00 ! Hemmed and hawed some more, declined again. Maybe taking a chance, but that's life !!
Moral of the story: If you decide to go for the extended warranty - grind 'em as much as possible on the price!
However, I do think that the extra year Forest River coverage for not much more than a hundred bucks is not a bad deal.