I have airmatic and it's fantastic. Some friends saw my car for the first time last night and wanted rides and a few said that they didn't think they'd ever ridden in a more comfortable car. Basically comfort mode absorbs nearly everything, sport 1 is the best of both worlds, I understand that it lowers the car 10cm and you feel the car staying flatter around the bends. Sport 2 lowers the car 5 more cm for a total of 15cm. In this mode it still absorbs the bumps but not like comfort, it's far stiffer and you do feel the road a bit more, however the car stays very flat around the bends.
The roads in Colorado change here and there because of the expanding soil, so we have stamped concrete roads that are uneven which makes for a very bumpy ride. In a car with a conventional suspension you fell your self being jostled forward and backward as you go over the bumps. This isn't the case with Airmatic, you don't really even know they're there, even in sport 2 while you feel them you're not being rocked forward and back. The suspension is kinda deceiving, I found my self not even noticing the potholes because you just didn't feel them. The greatest thing is, as I drive mainly in sport 2, if I start to feel some discomfort, I change to comfort mode and the bumps literally melt away.
With regards to maintaining airmatic. Everything like this has it's issues at some point and you pay for premium features. I still haven't seen a clear answer on what it costs to replace an airmatic strut or other various components. One post said $1,700.00 per strut, which honestly isn't bad as I owned a Nissan Maxima that needed a replacement strut and it cost $1,300.00. If a $400.00 difference gets me such a significantly more comfortable ride, then I'll pay the $400.00 extra bucks. This could be way off and it could be a lot more. Obviously it goes without saying, get the extended warranty regardless of which car you get.