Google+ Android App UpdateThis Apps has just updated on my phone. You now get all the functionality more or less of the web based version. Most notably for me is the ability to start hangouts from the phone.
This would be good if you wanted to have a live feed of an educational visit for example or any event and you just wanted to have a phone - not a laptop or tablet.
Tested with a few private hangouts - works well and very easy to use. Also works fine on 3G.