Howdy! Any of you guys/gals invest in one of these tile/grout cleaning machines? It is supposed to be a pretty good add-on business for tile installers, but I figured it would be better for us concrete cleaners who do it everyday anyways. I want to go ahead and purchase this set-up, but it is a pricey and somewhat risky investment. Therefore, I'm hoping you all can give me some wisdom on this. Thanks!