My Mrs is using the Shurflo. She's got it on a shopping trolley frame, it's made of aluminium and weighs next to nothing. She has 20ft of 6mm I/D hose between backpack and pole, this cuts down on time spent moving it. If you have to carry it up steps, the extra weight of the trolley isn't noticable.
We havn't tried any other make, so can't help you on that one. Dai