Pressure washing is much more physically demanding, especially on the bigger jobs. Carpet cleaning can get a sweat going but this is more to working in houses where heating is on. It is mucky too and you are reliant on the dodgy UK weather for re-sanding / sealing.
Honda engine is in my opinion best but Lombardi also supposed to be good. For me though honda every time. With proper PW you will also need a reservoir tank as they draw too much for mains to keep up.
Whirlaway excellent but a lance always required too. Turbo nozzle essential for really bad jobs.
Back to original post; looks good on paper but I would bet pound to a penny that this is sub-standard kit that will not take the battering. A good clue when looking around is that if the engine and pump are not named in the ad it's best to steer clear. Honda sells itself by reputation, as does interpump.