Hi Mike,
I own a Dry Fusion machine, and it works extremely well in the right circumstances. It will outperform a truckmount or portable extractor in terms of ease of use, quickness & appearance on commercial carpet tiles without the need for hoses. It will as part of the same cleaning process, leave a protector, deodoriser and an anti bacterial solution heat sealed to the carpets, without any extra work on your part. Did I also mention that it is extremely quiet and dries in 30 minutes.
The down side, it will not clean flotex because it puts too much strain on the motor, how many times do you clean flotex?
Having said all that there are other low moisture machines on the market which have there own unique way of cleaning and which should be given consideration if you want to go down that route.
Texatherm, Charley pads, Thermadry, encapsulation are some of the other low moisture systems.
The best thing is to try all the systems out to find which one will be the best for you.
Derek.