Gas Pressure Regulator

I am currently in the process of having my gas service upgraded to a 2psi system. My plumber is about to rough in and install all the piping, along with a maxitrol pressure regulator. This will be done a week prior to the utility company installing the new meter and upping the pressure to 2 psi.

Will there be any harm in using my gas appliances on the current 1/4 lb system with the regulator installed?