It works reasonably well, must use the two pad approach though, one to take the dirt off, the clean one to buff up. I didn't buy any ready kit, it's pretty simple to make yourself. Vikan easy shine kit, with adaptor, can all be purchased at Gardiners. Cheap X-tel or Harris pole and your off. Would need to use a backpack of somesort, Shurflo or WCW etc.
I use it on regular work, a lantern (above kitchen side, ladder impossible) and internal high level velux windows. I actually don't use a sprayer with those, I lightly mist the pad with some window cleaning spray and it works very well on 4 weekly work, I don't need to use the two pad approach.
It does seems to skip about a bit on awkward angles, it's like the pad gets stuck.