Robin.
I have the host CRB machine it came with five sets of brushes, gold is really soft and wool carpet, gold and white for mixs and white for polys others for hard floors .
Once I have sprayed the carpets with prespray and gone over it with the Host CRB the carpets look like it has been cleaned with an full extraction process. most of the time after the extraction process the carpet look very little different than after using the host .
I have a pro 35 crb but the Host seems to be far better at cleaning carpets than the pro 35 . It easier to clean as well and a little bit lighter and more manageable and takes up less room in the van it's a really must have item.
for me the sebo brushes are a little too harsh for a good wool carpet and difficult to clean , it is good for pre spray but doesn't clean or restore to the ability of the Host or pro35.