"Having used another air excavation tool for several years while working in the Arb industry I was all too aware of the need to adjust the design to make it user friendly and adjustable with attachments specific for tree work. The Arb-Ex met all of these expectations and more! It was a pleasure to use with bags of power with the compact size and adjustable front hand grip it felt like an extension of my arms providing accurate aeration with very little stress on the body!"
- mr. metcalfe, york
Very user friendly. Good ergonomic design so no prolonged usage of one muscle group. Easily maneuverable and adaptable for a range of situations.  
The fact you can re-angle the nozzle is a bonus as root grow at widely differing angles. That provides greater adaptation to different situations and results in far less potential damage to the existing root structure.
- dr. glynn percival, reading