Bob
I used the dry fusion system about 8 or 9 years ago and used to buy it in 25 litre drums i think and it was a hundred pounds or so just found i used a lot and then went onto texatherm but with that system you have to buy a couple of chemicals to mix.
I use prochem bonnet buff which has a soil repellant in it and does a great job i find also use it on domestics too.
Think if i was going to get another set up i would go for the dry fusion myself

I do most of my commercial work in the day and always get the carpet dryed in 30 mins and the only noise is from the vac :

Cheers clinton