Sci-tech experimenter, Ben Krasnow, is surprised at how well his super-cheap, homebrewed waterjet cutter turned out.
Apparently the little electric pressure washer burned itself up so he did try #2 with a gas one.. I reckon you could probably adjust the motor controls on an electric to "save" it if you were motivated.
I remember at Johnson & Johnson we had an OMAX waterjet. That thing could cut thru 1" thick steel. I have looked into FLOW also at my last company. Very intrigue process. I could find reasons to use that technology. Interesting thing is - airline carpeting is waterjet cut.