Well I don't think any of their current extractor models would last too long on a big concrete job, so I'm not sure I'd be promoting them too heavily myself--if the bags didn't clog prematurely, the hose caddies would probably snap. But between Collomix, Alpha and Metabo, I don't think anyone's missing out on too much. They've even got a grinder/tuckpointer thingy that rides on Festool tracks:
Its main purpose seems to be cutting control joints, but I turned a huge sheet of slate into little desktops with one in somebody's living room and there was very little cleanup to do afterward.