In the V8 model, all four wheels are driving with a 40/60 split using a Torsen torque sensing differential. The power will adjust back and forth between the front and rear wheels as needed. You just drive in AWD just like the Landdcruiser or Subaru. When the going gets real sloppy, you can push the locking diff button and the front and rear will lock--don't drive this way on dry ground. You can also go into 4Low by stopping, puttin it into neutral, and turn the knob into 4Low until the dash shows it's engaged. Then you have in essence a small Tiger Tank and all that's lacking is a good 120mm smoothbore cannon on the roof.
V6- 4x4 uses the more traditional 2 High for all around driving, 4 Hi for 4x4 with normal gearing and 4 Low after stopping and activating it for slow powerful crawl gear.
I have the V8 4x4 and it is transparant. There is very little to no negative difference in feel when turning or steering or performance other than an improved traction in all weather conditions. There will be many times where you won't have time to shift to 4High or just a pain to shift back and forth in low traction situations that aren't real slop conditions. Mashed down snow drifts or snow piles right after a plow has cleared the path is a good example. AWD gives you the best of both worlds, and locking diffs and 4Low should you need it.