You don't need a demo Rob, all you need to know is that they are lighter, more rigid than the SLX but also, they clamp at every half-way point. Eg. Closed- half extension- fully open.
Is it worth the extra dosh? I think so, but I'm a sole trader, so I make my own preferences. Less strain over a day, week. You might decide differently. I'm domestic mostly, but if you've mainly commercial jobs you might think it's more worth your while!! The SLX is a great pole though, and the Xtreme just takes it too another level.