This is a great thread and I am down to either using air bags or Ground Control coilovers. I will say that for me it is not about going super low... I just want to have the control to get every fender gap exactly right. The issue with cars is that even from the factory, there are either cars where the stock gap is not 100% uniform due to design or they are just off due to acceptable tolerances. Bear in mind I am not talking inches of differences of course. Significantly, at standard ride heights, especially on these older cars, the differences were not noticable because of the gap to the fender and the inward-biased wheel offset. Things however become much more noticable (to me at least) when the wheels come out and the fender gap goes down to say an inch. In this scenario, a quarter inch difference is suddenly apparent. Clearly either system will address this ride height issue BUT the proponents for air-ride advocate a strong advantage: The softer and more refined ride. One friend pointed out that top of the line Mercedes use air-ride and can only imagine that this is in effort of achieving the most refined ride and uniform ride height. This is is a great debate and for me the jury is still out!