As with all of the rending methods, there are pluses and minuses. I'm finding the ProJet3000+ resin (Shapeways FD/FUD) is best on small intricate detail, and has trouble with large flat surfaces. Any flat surfaces rendered should be done on the Z plane to avoid visible layering. Currently, I'm designing models in hybrid fashion, using the RP parts for the relief and etch brass for the flat surfaces.