The acoustic characteristics of the ceiling will mean soundwaves will be broken up
The main advantage of a suspended ceiling is one that you can't actually see! A suspended ceiling will be a superb insulator, both for noise and heat. The acoustic characteristics of the ceiling will mean soundwaves will be broken up and less noise will be carried through the building.
Likewise, the amount of heat loss will also be limited through ceilings and will keep it at a more useful level where your employees work. Not only will this makde the working environment more comfortable, it will also reduce your energy and heating bills.