The 4.8is is a harder edged vehicle, I suspect even than the new e70. And I will echo those who have said avoid any manufacturers first year high technology vehicles, especially sadly it seems, the german ones. The 04 first year Touaregs and Cayennes were nightmares. Ask me how I know.
Drive a 4.8is, you will either love it or you'll decide to wait. I really like my 4.8is, feels like a sport sedan instead of a truck with very quick reflexes. Plus it sounds just awesome, deep and powerful.