Yes they are very easy to use, I helped vak 100's of metres of guttering just before Christmas and it was relatively easy.
The hose is very robust, but I wouldn't allow any vehicles to run over it.
if you get one, ask Craig for the gutter agitator, you will need this to loosen up the compact dirt.
I can clear the guttering of a 3 bed semi in about 1 hour. not bad when I charge £5 per metre just to clear the insides.
Craig at CT east (Polarbrite) will look after you. they have very good after service too.
any more questions just ask.
Matt