Sorry took so long to reply i've only just found the thread again, only time i tried step up it kept tripping the main big yellow box, it was on a big site and there was too much coming off it because the kitchen fitters saw did the same thing. It's knowhere near as powerfull as a G4 and because it is speed adjustable take more getting used too, it has a water on and off switch and it'a b**ch to get used to because i'm more familiar with another machine. By the way Grand I'm an Old Hand at this plastering crack!