I use the procurve pole a lot, it's a very useful piece of kit...however....
I understand there is a 'mark II' one out now, but in general I imagine it is like the old one.
The method used to 'clip' the squeegee and washer on wears out quickly and it's well easy for either squeegee or washer to fly off!
I now just wedge on my old washer handle and the unger...er...swivel thingy squeegee handle (forgotten the correct name for it

)
When squeegeeing you can use it very much like the wag tail, and the bend in the end of the pole makes it very versatile (and it is the bend that allows you to use it like a wag tail).
Adding the Unger adjustable Squeegee handle simply adds further versatility to the pole.
But the pole is expensive for what it is and pretty plasticky and tacky I think, plus - at least on the original pole - when you extend it, the method used to grip it isn't very good. The extended part twists easily, and that's annoying.
But I will be getting another one soon, for all it's little shortfalls I think it's a great pole.
Though as most of my work is WFP, I don't use it on upstairs windows, only on shop fronts that I can't use WFP or the inside of other shop fronts and so on.
Ian