I am wondering if there were any changes made on the 2007 Suoer Z's from the 2006 model. I need to make a desicion on whether to buy a 25 horse 60 inch 2006 model or a 2007 model. The 2007 has 6 hours on it and the 2006 has 50 hours on it. They both were demo models. The 2007 is $7900 and the 2006 is $7200. Have all the issues been worked out of the Xr7 decks on both of these machines?