Composites ok for lower heights but not for 60ft. 16m gives you 42ft your three extra extn sectionsx 5ft 5" = approx 57ft so its the height you need, the M16 will do it with a light brush.Yes you will need to take care, keep the pole as vertical as possible when assembling and moving.Slide the back of the brush up and down the wall. Yes the moderns are thinner but stiffer if you have composite they would bend too much at that height, the brush bristle angle needs to be adjustable to almost vertical, clean on the upstroke rinse on the down.Its the top sections that bend so use c/f except for the tip.