My opinion - useless! Ive had the system but gave up on it over 20 years ago. The original importer/supplier went bust in a big way after touring the country demonstrating it to existing wet method carpet cleaners. Now the system is mostly used by certain so called 'dry cleaning' franchise operations. I say so called, because they usually have to pre spray traffic lanes etc first, thereby making it a wet clean. Not that they accept that of course, but the fact is if you are using water as a pre spray it is 'Wet!'