Where's the chat?
I couldn't tell you too much about the grands; only Jeeps I have ever driven are my '00 XJ, and my buddy's '95 XJ... I did hear about that brake rotor warping thing, and a lot of drivetrain noise too, maybe in the three years hence, they have figured out the problems...
Welcome to Jeepz... There are many others here who will be able to help you more than I can, stick around...