The Revolution used to sell quite well. I've seen for more Revolution 500's than 5000's. One of the catalogues stocked them for a few years in the mid-late 90's. Possibly GUS. But they really marketed the powernozzle on it. They were still pricey though and after the S5 Revolution came out, the price went up even more. Your average customer couldn't justify the price difference between the Revolution and the Cat & Dog/Solution.
I'd absolutely love to get a powernozzle C3, but it's going to have to be something to save for. We're off on holiday for 2 weeks in October and that hasn't cost as much as one of those does! 
