I keep my suspension on full sport all the time. I prefer a tigher ride, but compared to my other cars, even at full sport the GX feels very cushy (cushy in a good way.) I just got back from a Seattle to Whistler drive and was totally impressed how the GX did on the curves along the mountain roads. Plus I had four people, all our gear, and the back was happily watching Lord of the Rings. I couldnt be happier. Now if we are comparing ride quality to say, a LS sedan, well...of course there is going to be a difference. For what the GX is, I dont know of a better vechicle in its class.
People have also been mentioning the Toureg. I think that is a great car and the V8 is awesome. We are currently on our second one. First one was a total lemon and was in the shop for literally 5 months waiting for parts from Germany. VW was great and at no cost, replaced the vehicle. The new one actually had more options, but we were traded straight across. Unfortunately 1 month later it got in a major accident and has never really been the same since. :( It has just been bad luck with the VW in all respects...