All suck, trouble is a lot of the gutters look fine from ground level but are half to three quarters full of silt and moss. I did one today and after raking it with a spike i sucked the debris up. A lot of it clung to the insides of the poles and hose, you know this straight away as everything seems to double in weight. When this happens it's handy to suck a bucket of water through to clear the pipes.