We had a QX56 and loved it but the new JX does everything the QX did in a more user friendly, efficient and better riding way. Gas mileage has been decent while city driving in the high teens. The 2nd row has great leg room and the 3rd row can actually fit a 6ft adult comfortably.
all the safety features you get with the Drivers Asst package
1. acceleration power is lacking but not a huge issue just as long as you remember you did not buy it to be a race car
2. the jx has basically 5 different packages that have stipulations which may make you buy more then you wanted just to have certain options. some packages can only be had if you get another package with it