B&Q did a decent version for £50, used it weekly for a year - does a good job on the car
Worst thing is, the wifey realises washing the car is now more fun than chore - so you end up washing hers too
Great for cleaning bike wheels too... put bike on floor upside-down, spray directly onto chunky bits of mountain bike. It spins incredibly fast and the kids love the spray and rainbow you get on a sunny day
I even managed to use it for weeding the path too, cuts soft weeds in two - but sadly washes away all of the sand between block paving - oops
Oh - and if your hand gets covered in soap suds - DON'T squirt if off with the jet wash! It f-ing kills!!