[Gordon Booth]

I use a KArcher (K4 I think) and the spinning head is brilliant for cleaning paving, brick drives etc. Mind you you have to use the jet head to wash away all the muck the spinner washes loose. It doesn't dig all the pointing out either( I'm sure the jet spray itself could drill through a concrete wall). It's also very quick, using the jet sprayer itself on a patio is like painting the Forth Bridge with a toothbrush.
Cleaning a car? Not so good. Even if you use the shampoo attachment(the shampoo is very expensive) after you've jet sprayed the car you can still see a film of dirt which dulls the shine.
I once did a very good job of stripping most of the paint off my wife's wheel trims-conjugal rights withdrawn until I spent many hours repainting them.
Haven't tried other makes but Karcher have a good name.