airbody control is very nice. it makes the car ride so much better, plus with the driving modes you get to raise, lower, firm up, loosen up, and a bunch of other stuff with it. i have it an love it compared to the car i was driving without it. it makes the ride so much smoother, now if you have the Off-Road Engineering Package, not available in Canada, you also get even more options as 2112 mentioned above. more clearance plus the option to still drive firm and sporty where it hugs the road great. in Sport+ mode it is even more firm then my 1995 SL500 roadster.
for repairs, if you plan to keep the car out of warranty, yes it would be expensive to fix, of course. i would look at past model years to see how reliable the system is. i haven't heard much about Airmatic being problematic, it isn't like the hydraulic suspension where people have neglected their maintenance. as with everything, as long as the maintenance is done as stated, when stated, and you don't put stuff off, it should work for many years.
now the burmester system is nice as well, it adds nice interior accents. i cant say what the standard audio system sounds like though since i have always upgraded in all my cars. but i have no complaints about the burmester system. it depends if you are an audiophile or not.
