Ewan,
I like the Harris; it's a class pole for the money. It's tough, robust, and cheap enough to buy a couple of them. And although I do like the look of the £600+ carbon fibre poles, I'd be frightened to charge round with them the way I can with my Harris. I can bang it about, use it as something to lean on if I've got to negotiate a wall (ie climb on it or jump off it), and because it's cheap, I don't have to 'baby it'.
I bet there's no real time saving.