For those hard to reach swarms (up to 18 feet anyways ladder free)
WELL the theory is sound I think, practical application remains to be tested.
Simply expand the pole to the required height, put the water jug gently below the swarm and quickly jab the branch. Bees fall into water jug, and the rest is history, or at least I think it will be.
I am sure one of you have already done this, so any comments?