Used my flipper for the first time today. I thought it would be a bit of a nightmare and take a lot of getting used to. Wrong. Very impressed indeed. This is not the single pass tool Dai showed. I would say on first impression that it's not so good (or harder to master) on small panes, but on larger panes it is impressive. I don't see the lack of holding water as much of a downside for me. I wfp up anyway. But if you are using ladders, a B.O.B. should keep it wet. Not sure about it being faster than wfp, but for downstairs it would have a place in my toolbox (I still want to scrim which I couldn't do with a wagtail on a pole)