i prefer having 2 separate poles then you dont have the faffing about of extending and taking away sections.
25 extreme(main regular day to day pole)
47 extreme(for higher jobs and solar panel cleaning)
my extreme 47 is a godsend at full height.i used to have a supermax 40 and to be honest found it a nightmare to use at full stretch for solars or higher window cleaning.it bends too much and feels heavy.the extreme still bends but much stiffer and lighter.i dont use it that often but what i will do is after a couple of years ill swap the sections round so ill have a virtually unworn 25 extreme as my main pole and put the worn 25 on the 47.that way my poles could last 4-6 years before needing replacing.
best of both worlds IMO.

REGARDS
DAZMOND