You can click on the files in the right-hand pane to get the diff. Right-click for more options.
I've been using the beta(!) for a few weeks and I think it's a promising product. I also don't think software should be completely disqualified for not being open-source (, buddy).
I had a similar sense with the app. Despite the very slick UI, it just felt awkward and inconvenient in all sorts of little ways. I couldn't quite get at the info I wanted -- or couldn't do so fluidly. I couldn't quite do what I needed -- or couldn't do so fluidly.
I gave up on it in under an hour, which is kinda record time for me. I gave SourceTree a couple days, GitX/GitY/etc each got multiple hours, etc.
I've been using the beta(!) for a few weeks and I think it's a promising product. I also don't think software should be completely disqualified for not being open-source (, buddy).