but using a harris clampless is really fast and easy.
I've used a Harris pole for about four-or-five years. I've used the SLX for just over a month.
I know which pole I prefer, and it's not the Harris.
I find because the SLX is so much stiffer, and lighter; also longer than the Harris (I use the 18 foot SLX) that it's just so much easier. I find that even though I may not work quicker-per-window, I tire far less and I'm able to work far longer and still arrive home full of beans; and come the next day, I'm raring to get out and stuck in again.
Also, because it's lighter and shorter when closed, it makes ground floor windows easier to do than using a Harris.
I've used both poles; and I will never use a Harris again with the exception of certain jobs which wouldn't be routine external window cleaning.
The Harris pole is a great pole for £15 and probably beats other far more expensive poles made of fibreglass or aluminium; and maybe even carbon fibre composite, but for full carbon poles it's in a lesser league guys.
I'm not an 'equipment snob', I'll DIY where it makes financial sense to do so, but being honest here, I think it makes financial sense to go carbon. You'll tire less easily, work longer, and do less damage to your joints.
Twice last year I was in severe pain with my left shoulder; sometimes it was crippling; and I ended up taking Naproxen (a strong anti-inflammatory which really messes up your guts) for long periods and I have a note on medical records saying I can pick it up anytime I like without seeing the doc.
But since I've been using the SLX I've not had any shoulder problems.