But we’ve only just upgraded to React Router 2, and that was after the pain of upgrading from 0.x to 1!

Look, I’m a fan of regular, incremental releases, but I’m definitely sitting back on this one to see if your library really proves itself to be beneficial to our use case. React Router 0.x introduced a tight coupling between URL manipulation and UI rendering (i.e. the State mixin), but React Router 1 and 2 are more architecturally sound in my opinion, so our app is in a much better position.