I went WFP because if I didn't I would have got out of window cleaning altogether.
My knees were shot, I was getting older (48 at the time, 52 now) and didn't want to be humping 35ft 3 tier ladders about when I was 68 let alone 48

It re-invigorated my enthusiasm for the job and my earning have soared, anyone who says WFP isn't miles quicker than trad is doing something wrong! In almost every case (and I do regular time and motion studies) I am faster with WFP.
Getting it right isn't as easy as getting it right with trad but for the majority of the time the work I do is first rate.
Just recently I have had someone alongside me a day or so a week and have been training them up to use WFP, and I am constantly having to either re-do or pick up on mistakes, make no mistake, there most certainly is a learning curve to using WFP, at the moment I rarely trust this person to do upstairs windows, and won't until I am absolutely sure they have developed the 'window cleaners eye'.
Oh, and I am no slouch with trad tools by the way.
The money I can earn with this method is now a massive incentive, safety? pah! When I changed I gave no real thought to it...but now?
The realization of how much safer it is is most certainly a major consideration, until you come 'off' ladders you don't realise just how dangerous they really are, you become blazé and you don't realise the risks you take, and boy, did I take some risks!
But if yo uwant to make money with WFP, you have to be switched on or learn very fast indeed.
Ian