One thing I will say, coilovers are definately, 100%!more relieable. You'll never burst a bag, or have a sticky valve, or flatten your battery, or have an air leak woth coilovers. Any garage can work on them too.
I know a few trackday organisers that forbid air cars to go track.
Theres also the fact that the actual bag itself is perishable, so will need regular checks and potential replacement.
I think the air ride look is good, and I'd love to have them fitted to mine as the roads round here are toilet, but in my opinion the cost to value ratio isn't there yet. They need to be sub £1500 to be worth it. £3k gets you some nice coils and a BBK, a car on air wont know which way you went.
Not sure how removing the ARB improves the handlng either, someone needs to pass that onto the oem's so they can save some money!