pretty sure you have to have meticulous maintenance when it comes to aircats.
at my old workplace we used 3/4" impacts all day for mold changes, we typically had chicago pneumatic 772h guns, but they thought they would "upgrade" us after X years of using CP. and got the aircats that were supposed to be rated at a higher torque, be lighter, quieter, etc. well the chicago penumatics, in the ****** air system they had there would last about a year or two before needing serious rebuilds, but would still work fine, and some would go much longer without needing any serious work.
the aircats though, gave up after a few months with oiling, they lost a ton of power, lot of blowby inside, etc. and they weren't worth it after all of the guns they bought took a **** soon after the first went.
granted it was a dirty foundry environment, but they didn't last anywhere near as long as other guns under the same conditions. so maybe they will be good for someone who has air line dryers and oilers, and take awesome care of his tools. but i feel they dont last as long as other guns