AAAAAhhhhhrrrrrr: leave it there, lads. Don't turn this into another WFP versus Ladder users post.
Even I'm sick of it, and I love a good 'debate' (read argument).
But yes, without a doubt, WFP can do an equally good, or even better job than trad in a short time. I've no doubts about that at all.
But it can do a rotten job too, if you get it wrong.
As for my customers, some think it's the best thing ever, some don't care as long as their windows are clean (which they are), some would prefer ladders but accept the pole, and a tiny tiny minority (I can only think of two of my customers), would prefer me back up a ladder.
I've only had one complaint in the last six months, and that was from a lady who opened her sash windows when they were still wet, and dribbled dirty water down the bottom area.
But overall, I'm still over the moon with WFP. It can often be much quicker, it's physically less demanding; so I can find I can work longer, with a much higher moral towards the end of the day, earn more, and I'm safer.