When I bought my 05 I was offered a 30 month 30 thousand mile warranty. Thank goodness I bought it. One year and less than a thousand miles later, (it spends most of it's time stored) the rear differential plates started grinding after backing out of my driveway and turning onto an uphill roadway. I called my dealer and he suggested I change the rearend fluid. I did that and it still kept grinding. The dealer installed a brand new differential, housing and all. The cost to me was my $100. deductible. The insurer to a hit of over $3,000.
By all means, buy the warrantee!