I've got a star 4200 from gutter cleaning systems, very powerful but very heavy to lug around, an extra couple of minutes to set up because of the size in comparison to a small Clarke but faster on the sucking. I would recommend the gippavac poles because of speed of use, I currently use a mixture of gutter cleaning systems alloy and carbon poles but they take too long to set up where as grippavac are basically Gariners design poles, so fast to use. If you want to use if for 3 storey work then carbon fibre poles are really the only sensible option.
Simon.