I downloaded DiffMerge after reading about it on Eric's blog. There are a number of things that will keep me from switching from Compare It! to DiffMerge, in order of importance to me.
* Shortcut keys. I think the following shortcut keys are highly intuitive, and I miss them immensely. It's awkward reaching all the way up to the F7 key to go to the next change, not to mention also reaching all the way down to the shift key for the previous change.
Proposed shortcuts:
Alt+Up -> Previous Change
Alt+Down -> Next Change
Alt+Left -> Copy change from right to left
Alt-Right -> Copy change from left to right
* Moved block detection. I often move blocks of code around, and it's nice to have the diff tool flag these changes. (You can experiment with Compare It! to see what I'm talking about.)
* Syntax coloring. This isn't important enough to keep me from switching, but syntax coloring does make code easier to read.
DiffMerge Feature Requests
Moderator: SourceGear