Sean
I can't comment on system Reefresh ,it has different components & does not use Zeolites.
However ,if you are starting a tank it make sense to start the zeovit system from day 1 ,it will lower your cycling period by a great deal ,you will see a lot less algae blooms & phases.The Zeolites used for the Zeovit system are specially selected to absorb Ammonia ,that is one of their most important roles ,it will absorb the amonia even before the breakdown process of it starts,so yes you can add your animals alot quicker than if you were not going to start the tank with Zeovit.
In germany many new tanks are set up with Zeovit & reefscaped with Reefceramics & then fully populated with SPS corals withing 6 weeks or so ,I have seen it done many times .
Keep in mind it might be a bit longer with Live rock ,but just to answer your question Yes you can introduce SPS alot quicker
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