I have the 12" screen. I love the 12" screen in my truck. My wife has a Wrangler with the 8.4" screen ( I believe that it is the same one as in the Ram trucks). The 8.4 seems a little bit faster and more responsive than the 12", but that could be down to software in the Ram. I really like the split screen for some things and the full screen nav is excellent. It is a little bit bright at night time if I have the nav on. I have it on auto dim with the headlights, but maybe it is not working right...i am not sure. Anyway, there are benefits to the 12" screen, and there are good things about the 8" screen. At the end of the day I do not think that I would be upset if I had the 8" screen, but it is cool to see the reaction you get from new passengers when they see the whole center of the dash light up.