We've got one (The 75ft version).
Just clipped onto the outside tap, and we have our own nozzle on the end. There is indeed another flow tap that allows the water to be blasted out of the nozzle, and the hose retracts (Turn off the tap first and then open the flow valve and all the water shoots out the end of the hose). I think it's a good piece of kit and it doesn't weigh a lot either.
Have a look on Amazon as well because they sell them on there for the same price - they even do the accessories for them. Ours arrived quite quickly, but Amazon might be able to get it to you faster (And maybe a little cheaper on p & p).