Highest I've cleaned is 63ft and that was with a modular pole which was lovely and light and quite rigid but difficult to put together and take down on my own. Used a telescopic tucker aluminium pole at 60ft and that weighed a tonne and was shattering on the forearms and neck at that height but easier to put up and down.
Nowadays I only go to 50ft on a regular monthly basis frequently on several properties. I prefer to use modular poles where it's easy enough to assemble the poles and I have the room to work when it's not too windy, but if it's quite gusty I prefer to use a telescopic pole so I tend to use gardiners extreme pole or even an Ionics pole. The ionics pole is a lot heavier but is a lot more rigid and feels safer as it is more rigid as the pole is made to last but is tiring work using it all day.
I take my hat off to those who work at height as it is very hard work and you feel knackered at the end of the day working at them heights. Working on normal domestic work seems a doddle afterwards.