Hi this is my first post on here so please be gentle

Ive been cleaning windows now for the last 6 years, ive got a good round that i have built up over the years an all of my customers are very happy with the service i provide. I have always used the traditional cleaning methods with a ladder. The majority of my houses are link detached so i have to climb over a garage to get to the back of the houes. I clean 2,3 and 4 bedroom houses with and without conservatories and all are 2 story traditional houses.
I am continously asked to clean more houses but i simply dont have the time to do any more at the moment as i have also started cleaning some single story industrial units. What im after is if anyone has made the switch from traditional cleaning to the WFP system on houses like i do, if they have is there any benifit that can be obtained like speed and a better and easier clean? Also how much would a set up cost to get me started and what exactly would i need? i keep reading about the backpacks and i think this is what i may need as i have to jump over the back of some of my houses.
Any help would be appreciated.
cheers ste