so i am too lazy to retype my earlier response to air ride on importkiller's post so here is a copy of what i typed earlier:
well one good reason, is that as you lower the car to lower the center of gravity (a good thing to make the car handle better) the spring rate decreases (a bad thing) as you let more air out of the system
another is that most of the time you cant run shocks up front with the bags, this may have changed, i dont keep up on this stuff (and it has changed so never mind this part if you want the shockwaves, they have shocks built in)
and if you want to have side to side adjustments, you cant have sway bars
not to mention that you need a pump, air tanks, lines, valves which add a lot of weight and the increased load on your electrical system
and that if you are driving on the freeway and blow a line, bag, or some how lost pressure, your car would be dragging on the ground and you probably just hit something, or just caused major damage, if the car didnt roll, or you got lucky and it was a rear bag that lost pressure, and it would be no where near as bad
but again its just my opinion that air bags are not handling performance
and i am not saying that its a bad ride, they can be very comfortable
and i have heard the test where some company tested their air suspension against some other suspensions and it out performed them, but i believe what i believe
then jeremy gave a link to some stuff to read and this pic came up: (scroll all the way down to the bottom
http://www.ridetech.com/productinfo/shockwave.asp
look at this pic, and from memory (without the car in front of me) but my car doent have this cut out in the subframe to make room for an airbag
and that would substantialy weaken the subframe
and here is a pic of a sub frame, just to show that the cut out should not be there
http://i25.photobucket.com/albums/c87/HarleyD67/Smilies/25175736.jpg
again i stole that pic from importkiller's thread