Pete:
I only send the map files to Stu after Paul has had time to complete a review of the maps from two hard copies I send him.
The biggest advantage I find is not the color, but bypassing the copying and scanning so that my maps are no longer highly degraded. They should now reproduce quite well in grayscale if anyone cannot use color.
I told Stu that I did not wish to create extra work for him and I rather gather I do not. I try to send the files as batches, but perhaps I can stack them on a site for Stu to retrieve as time permits.