The spot meter behaves as a spot meter, regardless of the camera system you are using. Once you get used to one, it his hard to imagine using any other meter system, because it is such a versatile tool. It takes some getting use to, in that you have to remember the exposure it indicates for a given area is for middle grey. That's not different in principle from an incident meter, or the averaging, or center weighted meter of your Nikon, but you are measuring a very small area, so typically you need to measure at least the high, mid, and low, and decide where you want things to fall. The advantage of this is that you you have good information to use to place your exposures to favor exactly what you choose. Plus you can use it with any camera, now or in the future, including your Nikon, and it fits in a pack or on your belt. A dedicated spot meter will generally make you more thoughtful regarding your exposures, and helps immensely in promoting a greater understanding of tonal relationships. I would recommend one.