But my post is about developing your eye. When I'm shooting, color is all around me. I see the color but have a hard time "picturing" the grayscale image sometimes. If I set the camera to capture grayscale jpeg's I get to see the image in black and white and it helps me develop my eye but I don't get all the RAW data I want later during post processing.
So, my solution is to set the camera to capture RAW and JPEGs. Then I set the JPEGs to be captured in grayscale. The best of both worlds! I can edit the RAW later but develop my eye in the field. I'm having a lot of fun with it.