Hi Mate,
Good luck with your backpack, I've had mine 2 weeks. I got mine from cleantech and to be honest they were brilliant with me. I bought the backpack and a 30 foot universal pole to get started which came in at around £420 but its a fantastic piece of kit and I would say get one as soon as you have the money.......then get out canvassing because you will fly through your work. I have to say though the lad I dealt with at cleantech was brilliant and the backpack came fully assembled ready to work. I'm sure it was even charged, all I had to do was fill it up and off I went happy as Larry. Honestly I was putting bits and pieces off, not buying them and now I wish I'd put every spare penny into getting the kit because its amazing.