Well, We loved the '04 model minus the few things that I had to fix including the transmission cooler hose fail, leaking radiator, a chirping pulley under the hood.
The '08 seems to have less squeaks and rattles from the interior and the updated navi and audio system are great. The front parking sensor and power folding mirrors are useful when trying to cram the bus into our barely adqueate garage.
Overall, they both are great for what we need... safely haul the family and dog around on long trips (in style

)
I think the QX is one of the sexiest large SUVs available