Those things are like $1200 a pop. To make it easy to dig up lines. I am not sure I want to add the price of compressor rental to estimates. It sure as hell would make digging hard ground easier.
I am still trying to figure what you do with it. I can see some value for crossing a flagged area in the right of way to blow the dirt away from a buried utility but I don't see you digging much of a trench with it. Around here it would just be a sand storm generator.
One suggested use is troubling, "ground rod installation". Ground rods need to be driven, not buried.