Yes I remember the pics, was on the other forum if I recall, but that's operator error surely ?
I agree many of those companies who throw a wet/dry vac together with some Ali tube, and silicone bends and make grossly exaggerated claims which only leads to disappointment
We use the omni vac - great tool, never let me down, but experience has shown that I needed some non standard nozzle ends, I also gained some good knowledge from the FIL who was a builder and advised me on what you can and can't do with guttering and how to slip tiles back into place.
Done plenty of commercial stuff as well, but I know of one building approx 45 ft up with wide box gutters with fields and woodland growing out of it that would totally defeat any vac - but I know this and accept that access equipment, shovel, chainsaw, pick axe would be the only way to clear that sucker.
But generally vacs will clear as good, if not better than by hand and the most important thing SAFER
Darran