Maca,
I'm not sure what my opinion is worth, but I feel the NP3 is worth it if your going to carry it. I've got 3 92 LTTs now, 2 pre RDO and 1 RDO. Of the 2 pre RDOs, one is NP3 and one isn't. When I went to purchase the new RDO, I didn't hesitate to go ahead and add NP3. I'd be interested to see them offer the black Duralube finish they offer on their trigger bar for the rest of the gun including the slide.