The Cleaning Doctor Franchisees are very successful and would be the busier of the cleaners over here. There are 2 in my local area. 1 is Carpet and upholstery and the other deals with Hard floor and Contract cleaning.
They have good back up from the franchisor and although they are mostly single operators they do join up and tackle bigger contracts, usually out of their territory.
Aswell as being busy ,they are able to charge premium prices as people are more trusting due to the sales and marketing techniques (joe polish).
However I once got dropped from an ongoing contract as the cleaning Doctor came on the scene,(builders initial cleans) however 3 houses later I was back and commanding a higher price for the same work as punishment for dropping me

As for the franchisor IMO, not a nice person.
PS They use the Alltec and Dry fusion system for Carpets