For the Penny Saver, I was always doubtful.
Carpet Cleaners, for example will advertise 3 rooms and a hall for $35. The thing is, if you want soap, it is another $20, If you want stain pre-treatment, it is another $30, if you want a rinse, it is another $35. If you want furniture moved it is another $50.
So basically, if you want the job done right, it is still the $225 that any reputable company would charge.
How do you compete with that? The customer will call for a price, and say that is WAYYYY TOOO MUCH!!!! You look greedy, but the customer gets screwed out of his cheap price by the other guy, but his carpets are clean, and he can only grumble.
You know how it is. Some have service charges, some refund it "with repair," some only charge (high) hourly, some jack up the parts. Everybody has to make costs, plus a living. But penny saver seems to bring out the real bottom-feeders. I'd only go that way if I was starting out and desperate.