If 1.5 got rid of the new version of the load/save bug (the need to save and reload each turn) then it might be worth considering. I´ve tried 1.3, however, and due to the mentioned new L/S issue it took the enjoyment out of the game really quick, as I tend to do long sessions and very seldomly save.
For now, it´s back to 1.2 for me.