An ESSENTIAL for any team hoping to efficiently co-ordinate 100%ing the main game or any full-fledged ROMhack. If a mod makes me question why it's not a base feature, it must be an instant fiver.
The only flaw encountered so far..... an odd glitch where the key collection sound spammed many times over, frightening a friend of mine with it's overwhelming volume. He now leaves the key collect sound off, just in case. This may've been an issue with server desynchronisation, though further incidents can be prevented by limiting how many announcement chimes can play at once.