I use the original gutter sucker which was one that spinaclean sold a few years ago, (great company to deal with) maybe under a different name i think. Anyway its been a great machine, has 3 motors on it and moves most debris out of the gutters.
I use carbon fibre tapered poles, really light and strong, just got to keep them clean or they will potential grip tight, rinse them off regularly.
When i change this one i might get a smaller container as it does take up a lot of space in the van, it holds a lot so gets proper heavy when its wet stuff thats going in, you wont have that issue with the atom.
Not sure about those prices, maybe London prices and time taken to clear a semi detached (unless two people maybe) as it takes about 10 mins setting it up and putting it away.. still a good earner though if you can get a regular annual clean going from enough customers... start with existing customers and work out from there, referrals etc. worked for me