Hi Woodman,
I bought one some years ago. Glyn is right they are light to use and only for truckmounts, However they are cumbersome to get on and off the van etc. I sold mine for several reasons:-
It was too aggressive for the type of carpets I typically clean. e.g. wool carpeting with seams and borders.
It wasn't any faster than a wand
It sometimes left bad swirl marks in the carpet that were very difficult to remove
I felt it left the carpets wetter if you didn't do lots of slow dry passes which further reduced productivity.
You still needed a wand to do corners etc.
In its defence it does provide a deeper clean on trashed carpet tile but that wasn't a large part of my business.
Nigel