Does anyone have experience with the SpyderCube for adjusting white balance?
SpyderCube
I just got one. Haven't had time to use it a lot yet, but it seems to do exactly what it's suppose to do.
It does provide a great reference for white balance, but I wanted it just as much for measuring tonal range from deep shadow to specular highlights. I haven't had anything else that can do that consistently, while still being as easily carried in the field as the Cube.