hi richy.i used to have a supermax 40 and it was a total nightmare at angles when cleaning solar panels/velux on roofs as there was so much bend in the pole it was catching on the gutters so id have to clean them with the pole above my head!ok for straight up windows though.a lot heavier than my 47 as well.
id say get the extreme 47 mate as if you get solar panel jobs or customers who want velux cleaning on their roofs your gonna struggle with the supemax.
once you ve bought it itll last you years.i use mine about 10 times a month.more in the summer months when cleaning my yearly solar panels jobs.its still looks brand new after 18 months.prob last me 10 years!lol.
