i just bought a clarke 30 i will be honest i have only done my house with it and first impressions its great i do alot of gutter cleans off ladders and it is about time i treated myself to one i have bought the generator aswell ,very very good suction on the vac and the genny is very compact easy to use, i dont think the clarke 20 or 25 is big enough very glad i bought it, hope this helps guys