For the price of them they should come with a 5 year warranty. Make it subject to a yearly inspection and proof you put the wear parts into it on your own dime. Would be a good way to take some market share. Lots of guys won't believe the grain saving and capacity until they see it for themselves and that would keep them in the Claas next time around, the warranty would be the hook to get them in. Even the new guys should be keeping at least 3-4 years anyways. I'm going into year 3 with mine and am less concerned about down-time than when it was new. Based off my experience the extended warranty is only there for peace of mind about some freak thing happening with a major component.
AN ERROR DOESN'T BECOME A MISTAKE UNTIL YOU REFUSE TO CORRECT IT
Orlando A. Battista