Not OP but I'm still on 1.2 because I still had to support IE8 when 1.3 dropped it out of the blue (I wouldn't have used 1.2 if I had known the Angular team planned to drop IE8 support). Shortly after, Angular 2.0 was announced and at the point where IE8 was no longer a requirement Angular 2.0 was still not stable but not far away enough to justify spending energy upgrading the codebase to another 1.x release in the meantime (especially as AtScript was still a thing and there was no clear upgrade path yet).
The app is still in production but parts of it have been rewritten in React since. Despite the added weight of another library, introducing React ironically helped reduce the file size (mostly because it allowed us to remove dependencies that were no longer necessary and the build process changed with bower being replaced by yarn).
EDIT: Another factor in the decision not to upgrade to 1.x when we were able to drop IE8 support as a requirement was that the removal of IE8 support came so abruptly that we decided not to trust Angular to support any browsers that aren't on the latest version (i.e. we expected them to drop IE9 support equally sudden and it seemed clear that Angular 2.0 wasn't going to be built with compatibility in mind).
For comparison, when we added React to the project two years later (when IE8 was no longer a requirement), React still supported IE8 and only several months later announced that they would drop support with the next release. But even then "dropping support" meant that bugs were deprioritised whereas the AngularJS announcement heavily suggested that existing code for IE8 would be intentionally removed or rewritten in a way that breaks compatibility outright and the code should be expected not to work in IE8 at all.
So based on how the announcements were made and what "dropping support" entailed in each library, React seemed the safer bet.
The app is still in production but parts of it have been rewritten in React since. Despite the added weight of another library, introducing React ironically helped reduce the file size (mostly because it allowed us to remove dependencies that were no longer necessary and the build process changed with bower being replaced by yarn).
EDIT: Another factor in the decision not to upgrade to 1.x when we were able to drop IE8 support as a requirement was that the removal of IE8 support came so abruptly that we decided not to trust Angular to support any browsers that aren't on the latest version (i.e. we expected them to drop IE9 support equally sudden and it seemed clear that Angular 2.0 wasn't going to be built with compatibility in mind).
For comparison, when we added React to the project two years later (when IE8 was no longer a requirement), React still supported IE8 and only several months later announced that they would drop support with the next release. But even then "dropping support" meant that bugs were deprioritised whereas the AngularJS announcement heavily suggested that existing code for IE8 would be intentionally removed or rewritten in a way that breaks compatibility outright and the code should be expected not to work in IE8 at all.
So based on how the announcements were made and what "dropping support" entailed in each library, React seemed the safer bet.