This one is going to be pretty short, which is a shame, but I finished this book several weeks ago and don't have a lot of strong take-aways from it to keep here. It's far, far better than Paulson's book. I thought it was more comprehensive in explaining the underlying issues during the financial crisis, as well as the resolutions. Geithner's book is obviously much newer, and so had a lot of detail I hadn't really read about yet (from the insider's perspective) on recent Fed action, and on the European banking crisis. I would say overall that this book, paired with Too Big To Fail are probably the go-to recommended resources on the crisis.
Only thing I didn't really care for was how apologist many parts of the book came across as. Geithner was on the defensive the whole time, talking up how great Obama (and, to be fair, Bush) dealt with the situation. That part got a bit old.