I've had a gardiners backpack 6 months now , it gets used about 30 hours a week and is still going strong . Now I know there only about £100 to replace . But where can they go wrong , and is it worth buying a spare battery , or pump .and how easy is it to replace any of those . Cos I know it will fail sometime soon and I don't wanna be stuck even for a couple of days . Cheers barry