Dear I am afraid to tell you that I am a happy Turbo owner and no intention to sell it at all.
No issue faced with navigation unit
Oil change takes place at 5000 km or 3 months . Hopefully you are using 0w-20 by Honda.
After software upgrade , knocking is no more but if certain pump gives bad fuel, it knocks sometimes which is not an issue for me as it is only during hard acceleration.
Alhamdolilah a satisfied Turbo owner