I noticed there were no responses so I thought I'd check your post. This is always a tough question. I had a JD 9650 that was terrible the first year. I thought I might have a lemon, but the dealer said that for the money he'd suggest I not get the add warranty because they had found 2nd year machines to be really good even with as many quirks as mine had. I counted them and had over 20 unrelated service calls, but none of them were issues that the dealer considered to be chronic. As it turned out, the machine was excellent for the next 3 years.
I think that if you were concerned about a major chronic issue the $6000 might be worth it, but otherwise I'd probably balk at the extended warranty especially if that's only for the 2nd year. Maybe someone else will have some input, but a good dealer can be of great value in making this decision.