I looked at these extensively when I was shopping for a used trucky mid-sized SUV. The tailgate design is nearly useless and the third row seats are a joke (on the floor and flip to the side when not in use.) Ride was good, a little jittery but that is to be expected. Power was so-so. The interior was not well laid out but materials seemed good. The high resale prices is what killed it for me.
I ended up with the LR3 for about $10k less than what an equal year/mileage GX was going to run. Outside of the reported reliability issues the Rover is superior in every way (ergonomics, interior room (simply brilliant 7 seater that real adults can use!, sound system, on road ride and off road performance.)
I can't believe Toyota left the swinging tailgate on the new GX.