Liahona
As the RugBadger is my company, i do have to speak up when you are comparing it to airdusting.
In North America we have many folks here that have air dusting setups AND they are buying RB's to enhance their dry soil extraction capabilities.
What many have discovered is that when air dusting is done correctly with the right tools and air compressor it is very effective on the lighter soils, however the RB will always do better at dislodging the more abrasive, damaging, stubborn, gritty and impacted soils.
The big advantages the RB has over air:
-you can RB indoors
-far less expensive then a big compressor
-much cleaner process
-more effective on heavy soil
-no need for huge 3 phase power
Pleae don't take my word for it. Just google and find folks that are using it and ask them.
To find out more about air dusting and a very advaced rug school just click here:
http://www.orientalrugcleaningschool.com/