most of us have done it mate.
i started off with long closed length glass fibre/ali poles then hybrid,then carbon,then high modulus carbon!same with brushes!vikan,supalite standards, then extreme!
dont write off the SLXs.they are good light poles but for higher work you cant beat an extreme at 50 ft.
you could just buy a 47 and break it down and use it as a 22 or 25 and add sections when needed if you want to save money.although you wont have the insulated base section.
i prefer to have separate poles and save the faffing around.
the 25 gets used for the majority of my work and reaches most windows from ground floor to 3 storey(2nd floor).
the 47 gets used on large domestic,some commercial and solar panel cleaning.
the rigidity of the extremes makes scrubbing the glass easier and obviously the lightness is amazing.my slx 22 feels like its made of lead after getting used to the extremes but still useable.
the real benefit is felt when your reaching at full stretch over a kitchen extension to clean upper windows set back or windows over connys.this is where strain is more likely with heavier poles.i have lots of awkward windows on my round.
i also have large domestic where im using the 25 fully extended just to reach normal 1st floor windows.
the only gripe i have with extreme poles is i wish they had woven in banding on the stop indicators instead of tape as it wears away after a while.ive replaced the tape but its already coming off after a few weeks and getting chewed up.its a minor little niggle though.
regards
dazmond