In my instruction manual there isn't an E focusing screen, maybe you intended H , there is H screen,
anyway i have C and D , D has the grid but you have to focus looking just at the ground glass so
is needed a little training to focus without a split image.
I have two 650 and one 630 eos but in one of the 650 autofocus doesn't work so i'm planning to buy the
L screen for that camera to use with manual focus , L screen is splitted i 4 parts , i think is the best
as gives vertical and horizontal alignement .