Bloody hell you don't want much do ya
1) Just
2) don't know
3) doesn't have the best reputation
4) hypo
5) does come in handy, but I don't use mine on every job
As well as the machine you will also need a buffer tank, shovel, brushes, watering can/sprayer, spare high pressure hose, variable nozzle, turbo nozzle, waterproofs/wellies, goggles etc