This is the best bit of kit you will ever buy after a truckmount.
However porty users with one of these dont need a truckmount

( did I realy say that).
If you pre spray ( what ever you use, m/s detergents,enzyme what ever) and then spend a good time aggitating with the envirodry ( e40 best) make sure walk areas get lots of aggitation. Then just rinse WITH WATER ONLY, hot obiously, at around 150 psi then the carpets will look like new.
Most of the time the customer thinks the job is done straight after the aggitation.
It brings the pile up great.
Brushes are hard to change at first but just turn the brush as you push the rod in and with abit of practice its easy and takes seconds.
The good thing is you can rine at a lower psi that lets the carpets dry quicker.
I have tried all the conta type aggitation machines on the market and the Envirodry e40 is the best.