My air impact is an IR that I have owned since the 80s working as a fleet mechanic. It works fine but I just never use it any more. I am a big proponent of choosing the right tool for the job.
If you are primarily doing Porsche and other passenger vehicle lug nuts, most are hand torqued to 95-120 lbs. As a result you really don't need a super heavy duty impact driver at all. Almost any light weight 3/8 cordless driver is good for 150 lbs and will do tire changes all day without ever firing up the compressor. This is what I use 70% of the time these days. A modern cordless w/2 lithium batteries will probably last 20 years and weighs about 3 lbs. It is useful for working on cars, mending fences, building decks, household projects, appliance repair, and so many other uses. I installed a new built-in microwave yesterday and the lightweight cordless made quick work of all the mounting hardware.
What about those nasty rusted trailer wheels that need to get pulled and the 3lb cordless won't touch em? I have a choice to either break out the heavy duty impact wrench or just grab a breaker bar and 5' helper. Most of the time a breaker bar will have the job done before the compressor is filled and hose is connected.
Air tools still work but they are just loud and clumsy compared to a modern cordless tool.
This is the lightweight 3/8 driver I use and weighs 2lbs. I also have a medium duty 18v 1/2" impact and a heavy duty 1/2" impact. The smallest one sees the most use.
https://www.toolsid.com/makita/12v-max-3-8-anvil-cordless-impact-wrench-mpn-wt01w.html?view=152361&gclid=EAIaIQobChMI5K3gmdzq5wIVgcBkCh2JYAckEAQYCCAB EgKE6vD_BwE#specifications