 We travel a lot with 2 very tall kids.  So when searching for a large SUV, rear legroom is a must.  Having looked at all the typical choices (GMC, Chevy, Ford, Cadillac, Toyota, Lexus) once we looked at the Infiniti, nothing else came close.  The number of options that are standard are amazing (i.e. heated steering wheel, rear heated seats, auto fold side mirrors, power 3rd row seats, power liftgate, etc.).  The interior design and legroom of the QX56 are far superior to the others.  The space behind the 3rd row seat is somewhat limited, but rarely do we use that seat.  Mileage isn't great, averaging about 15 mpg between city/highway driving, but I knew that going into the purchase.