Anybody used the 25 cfm airspade nozzle w/smaller compressor?

[Dead Cottonwood]

If so, how effective was it and is it worth purchasing. Looking to build a small, portable air spade setup and wondering if that 25 cfm will get the job done

 

[Brando CalPankian]

Can you elaborate more on what your small setup would look like? I'm wondering about cost effectiveness. Are you just using it for root crown excavations? I'm curious now too.