i use my extremes all day every day for everything including f/s/g cleans,conny roofs and solar panels.
my main 25 lasted 18 months and im on my second extreme 25(bought in dec 14).the older one just needs the top 2 sections replacing and itll be good to go for another 18 months i reckon.
as for snapping poles.ive never snapped a section on any poles ive used in nearly 5 years wfp and i shut windows with em every day.maybe ive just been lucky.
my extreme 47 gets used about 10 times a month and its coming up to 2 years old.it still looks brand new.i reckon itll last me 10 years before needing a replacement.
if it does last me 10 years thats less than £100 a year(it was £850 in the sale)less than £2 a week to use the best lightest high level pole on the market.