If it's a 2001 there's no risk on updating to 6.61 which is the latest firmware, but if you are happy with how you are then keep it. Updating might make your console compatible with newer games and some tweaks here and there.
I have a question about Medicat if anyone can answer.. My windows install is corrupt and wont boot. Does Medicat allow you to run DISM online or do an inlace upgrade? Trying to do some sort of repair install or recovery without a fresh installation