The FX has a horrible ride. It is tuned to a much more sporty mode than anything out there. It's very harsh, jitters over any small bump, and throws the occupants all over the cabin when the roads get rough. The Cayenne and X5, equally sporty in nature when pushed, has a much more compliant ride. The MDX cannot corner worth a hot damn, but the it's not designed to. It's way more smooth.