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I keep mine on my D700 and D3 at +3. I do this to encourage me to actually expose darker than my final image because underexposing and bringing up in post is how you get the most dynamic range from the sensor. With film it's common to expose for the shadow and develop for the highlights, with digital it's opposite, expose for the highlight and develop for the shadow.
So at +3, when the image looks "right" on the screen, and there are no blinkies (red channel only) on important areas, my exposure is exactly what I want, even though it's actually about 1 stop underexposed from the final image. Then my default LR preset has brightness cranked up, which affects the mid tones and leaves the highlights alone.