Unsurprisingly, it turns out that ActionBarSherlock is amazing. I was able to get Rounds running on Gingerbread in just a couple hours thanks to this brilliant library.
I'm impressed by how faithful the adaptation is. My app looks and behaves the same on all Androids! Instead of coping with version issues I get to work on features. It just works.
If you're developing an Android app, you should use ActionBarSherlock.