Hi Cameron, and welcome to the board! Remember to read the Welcome Message post and tell us a bit more about yourself, won't you?
I use the Unger TelePole Plus which is aluminium, they came with my trolley system from
http://www.window-tools.com and I'm quite happy with them. My maximum height is about 30 feet and I have no problems handling this size and weight of pole.
I think the only points they might wear out at would be the twist grip locks, which can be easily replaced, and frankly I'm stunned to read that some poles wear out after a matter of months. Have the firms who sell these - and also the folk who buy them - not heard of the Sale of Goods Act, where goods must be fit for the purpose that they are intended for? I think that's taking the term "built-in obsolescence" a bit too far!
Or maybe I'm quite careful with my equipment - and no offence meant to anyone, before I get flamed!