Your right Smurf, it will not break any thing up, but for general vacuuming it works well.
For removing weeds etc what I do I use an M6 nut, remove the thumb screw, point the thin head at a very sharp angle outwards and tighten with a spanner which holds it, this is very effective, you can do the same with the weedhook/downpipe clearer for weeds etc. We did this on a school job just before Christmas to get to the back of ogee shaped gutters with the roof overhanging most of the gutter.