my 22ft CLX reaches some 3 storey windows
my 25ft SLX is a good all arounder and reaches nearly all my work
then i have a 40ft SUPERMAX which comfortable reaches 4th floor windows,maybe some 5th storey as well as most solar panels on normal house roofs and skylights.
i find having seperate poles best for me.i couldnt be bothered adding sections,taking base caps off and messing about with different lengths of pole hose etc.
for instance im cleaning a block of small granny flats today.easy reach windows and the old folks come out to pay me as im cleaning so i use my 22ft CLX with aqua-daptor.its easy to turn my water on and off as i get a few interruptions!!!