i've got an 06 xterra but mine's 2wd. i like it so far. i haven't had any problems with it. the only thing i've run into is a loose belt or squeaky tensioner which started last fall. mine has 52,xxx miles on it now. i just haven't had time to figure out which it is or take it to the dealer to find the problem. but other than that, the motor is real strong and pulls hard for an SUV. the 4.0 DOHC is niiiiiiice.

gas mileage isn't too bad, i can get about 300 miles to a tank before the gas light comes on but i don't like that it takes me $60 to fill it up.

hope that helped, if not just PM me if you have any questions. i'll try to help out as much as i can.