I apparently didn't notice that the newer one was different? I have had a bushing in my F model since I got it and haven't used that part. I'll have to look at that specifically on Monday.
I agree with the edgingplate/angle arm, etc. just for the versatility. I have only used it that way once, since I have MFK 700 too.
I guess I never noticed an "older version" of the edge guide. What was different about them? More adjustable like the ones for the OF1400?