I make a lot of camera parts on a Flow waterjet machine. You have to keep in mind that it is not "tooling" and is only as precise as the condition of the mixing tube and what grit abrasive is being used. The two shops I've used both choose a medium grit as a compromise between precision and cutting speed.
It's good for locating holes in parts, but I suggest undersizing them, then go back to open, tap, countersink, whatever.