Hello I am thinking of purchasing one of these. http://www.thecleaningwarehouse.co.uk/window-cleaning-di-backpack-kit-4074-p.asp I mostly use the traditional methods and will remain that way but some windows just can't be done. I hope to use this for those jobs and maybe use it for conservatory roofs. I'd appriciate anyones opinions and experiences about them and maybe show me ones that maybe better for a good price. Thanks, Sam.