First the one negative I find worth writing about. The notification Icon scrolls away in this app, rather than staying with you, as the web page does. So if you wish to check it, you have to scroll all the way back to the top. Not the end of the world, but annoing enough to cost it that fifth star.
The reason I do like this app so much is the fact that it fixes the biggest annoyance I find with G+ on the web. That is the rolling and jumping around it does, each time someone posts in your stream. Makes it impossible to read anything during active times, on the web. Using the app, the only thing that happens when you get new posts in your stream is that the scroll bar flashes. No having your stream jumping around every half-second, while our trying to get through coments on a post, or watch a video in-stream. Honestly, finding this app, and the fact it fixes this glaring problem with G+, is the main reason I still use the service. I was ready to give up with it, when I discovered this.
Thanks guys, for a good experience, mostly. If you fix those few little things, I think youll have a real winner.