I plan to always restore from a backup in the hope that it won't kick me out Remains to be seen if it will know when I get a new handset though.
It won't work, just smashed my phone and restored to the replacement.. not working! There isn't even a paid for option if you are just using a @gmail.com account either, got to either use the GMail app, use your own domain with google apps or move away completely.
iOS 7 will see background downloads, triggered by push notifications.
The Gmail app will become on par with the native app, once they support that.
It's a shame the Sparrow guys got bought by google. These are exactly the kind of APIs they needed!