We used it a lot in the early 80's. It had trichlor in it then and cleaned pretty well. Then they introduced a new citric scent Host. What they didn't tell us was that the trichlor was replaced with delimonine. Didn't clean nearly as well.
Aside from all that, it is slow, expensive and a pain. You haven't lived until you are cleaning in a lady's closet and find that the Host flew up into her shoes. As to commercial use, it is pretty good on a maintenance plan if you are cleaning clean carpet and that is how they sell it. However, who will pay you enough to use it.
There are many better options.