I found the fact that you can open directories, in a "Left" and "Right" fashion, and get a simple summary via the comparison result tab.
Also being able to filter by extension for the type of files to diff is handy (*.inl, *.h, *.cpp)
Also from the directory comparison you can go through each file and through the context menu view the diffs of each file.
And then there is a few features in the UI, like "copy all left" (or right), and next diff, and getting the exact diff per line.
I know this all sounds trivial.
I just found this a simple (and free) tool that addressed some of the pain points I had with Tortoise (which is still great in my book.)
David:
If I think of anything else, I’ll let you know.