I always see the 2013 recommended but I specifically went with 2015+ for a few reasons. First, I love the radar cruise, had it on my 2010 Autobiography and my Toyota Sequoia before that. Second, I live in Boulder, CO and the power loss at altitude is quite noticeable. My 2006 RR feels like a bit of a dog, my 2010 Supercharged 5.0 was amazing, but when faced with a 5.0 non-supercharged or a 3.0 supercharged I chose the 3.0 due to the ease of getting some of that power back. I put a tune and an overdrive pulley on it and now it gets up and goes just fine. Third, I love the 8 speed transmission. Even with my 2010 RR having over 500hp it still would start "chugging" up steep tight turns (which there are quite a few of in the mountains) at speeds around 15mph. It would shift up a gear, but not quite have the power to pull the gear smoothly. No such issues with the 8 speed.