Interesting old thread here.
I just bought some .25 diamond spray and some .5 CO paste made by handamerica and sold up here in Canada online at classicedge.ca to try out.
I applied the CO to a balsa stropping board, and the diamond on a felt board.
To my magnifier and eye the .5 CO seems to shine the edge up better than the .25 diamond which surprised me.
I am waiting on a microscope add on for my iphone which will hopefully give me the ability to actually post the different edges I am getting so far as I get into this aspect of SRs more than I expected to.
Chasing a perfect edge seems perfectly logical to me now..
;-)