Not had that exact brand, but they are all the same really!
We've hired them a few times - had cream carpet in the front room of the cottage and cleaned it when we left, same as bungalow...they do work really well - but best done and then the room left - I find if the room is used it goes back dirty looking quite soon as the carpet isn't 100% dry
I don't have carpets down stairs - too much hassle...wood and tile all the way for me!