if you don't have any issues leave well alone, if you go to the asus site they should tell you what issues the updates fix. i only do it when new hardware if not recognised or running properly. if they go wrong you may get a won't boot situation.
don't flash if you're not sure what you're doing.
never flash if windows is unstable, ie a week without a crash.
disable everything running av etc if flashing from with windows.
and don'y flash if your system is running fine.