well I'm comparing those surfaces that would otherwise be done with a pressure washer, so surfaces like concrete such as those found in workshops and garages. What about patios made with flag stones of different stones, assuming there relatively flat one of these machines would work right or not? I guess irregular surfaces may not work so well??
What I'm trying to get at is could these machines do work that the customer may find more favourable to a pw because there's less inconvenience in having it working whilst the premises are open, i.e. less area cordoned off, no spray, less noise etc. Also, its an inconvenience having us round when the premises may otherwise be closed!
I'm intrigued cos I think there maybe some crossover here!!