There are certain cases where it is appropriate to have a commercial registered agent represent your business. If your LLC is filed in a state like Delaware, where there is no officer info or business address that is public AND you do not want anyone to be able to find you, it might be wise to have a commercial agent. Or, if you are foreign qualifying your business to do business in another state where you do not yet have an address you will need a commercial agent. The reason for this, is you do not have an address to put the agent at yet. In that case, you may start off with a commercial agent, and once you obtain an office use that address.