Having recently had at my disposal a Ghibli with sports suspension and two different wheel choices, and a Ghibli S with skyhook and 21" wheels. I can report that skyhook rides superbly on 21" wheels, but beyond that the float and "wait and see what the computer thinks" type feel you get with skyhook does not do the car many favours. Also, the big wheels are mistake because they bring up horrendous changes in direction die to camber changes. It may be that this car was not set up correctly, because geometry is so critical in these cars. The sports suspension in the diesel with the 20" wheels also showed these camber change traits. Somewhat disconcerting. The real revelation was the sport suspension with the 19" wheels. Not as sexy looking, but the handling was superb. The ride good and more than acceptable. So don't choose wheels on looks, go on what drives best!