I've had no problems with Airlifts but 2 of my buddies did... both of them were running the 180PSI bags at 200PSI. True, Firestones and most other bags can go over the rating but from what I've seen, they always work nice and last for years if they're run below the max PSI and the brackets are where they should be. If your bag slams down crooked that's gonna cause problems and I've seen people blame it on the bag when bags aren't designed to sit like a fuckin crushed pop can. And... Contitech 4 Ply bags are the shit... I'd say they're the best built bags you can buy that will really handle high pressure.
There is no perfect bag... but I really haven't seen many problems with Airlifts and I'd say they are a great bag for the price as long as they're installed right. A buddy of mine has had them for 2 years now and had zero problems... running anywhere from 100-250 psi through them at various times.