I have found an Aventura II XLR that I will probably buy soon but I can't find any information about it. I don't find any YouTube videos or descriptions about what made them different from other models, have many been built, what should I be looking at if this is a more unique or different model? Are there some unique or difficult aspects that have limited the number made? There is a glass panel from 2007 and some of the info is showing they are no longer upgradable (like the GPS charts, etc.) without upgrading to a newer model. Any info will help since I would like to make a purchase BEFORE heading up to Oshkosh in the next couple weeks.