2 snap on 725s in the shop, both of the owners have to borrow my 2235 regularly, nearly daily, because theirs won't pull something or another.
The hf 3/8 earthquake I gave away did not impress me. It was strong enough, just had awful control - I gave it to someone else who had the same gun fail on them less than a month after they bought it.
Don't know about the aircat stuff, I've seen it on the truck, but it hasn't been around very long, at least not compared to IR.
Even in harsh environments the IR does pretty well. I know a guy who runs a big tank cleaning company, hazardous/corrosive materials, etc... and they also do a lot of work in the gypsum mines.
Pretty rough working environment for air tools.
He brought me about a 55 gallon barrel or so of old impacts, mostly IR 3/4", but some 1/2" and other odd air tools, with a few other brands, but mainly IR.
Most of the tools were so badly corroded they were locked up solid and I had to beat the couple I rebuilt apart - I did 2 IR 3/4" guns with $60 rebuild kits and they worked like new afterwards.
I decided submerging them in transmission fluid for a couple weeks would possibly make them easier to get apart.
Fortunately they hired a new mechanic who didn't have a lot to do so they took the rest back. I was happy because I didn't really have the time or desire to mess with them anyway. I will have to remember to ask how they turned out next time I see him.
Oh, they also tended to get hooked up to the blasting pressure lines quite a lot I guess, and those are like 600-750 psi if I recall correctly, several times the pressure an air tool should ever see in any case.
So if anybody knows of another besides IR you can buy, let random employees abuse horribly while exposing to highly corrosive environments until it stops working even when beaten upon, then throw it in a barrel for a year or two, then hammer it apart and rebuild it good as new for $60ish I would be willing to consider trying that brand.
Edit: worth noting the IRs were several years old before they failed, as were a couple CP, the other off brands didn't look that old although there were only a couple of those as the company generally wont buy anything but IR as they fail right away.