The SIM2 is a driver designed to offer low spin rates and mid-launch, which makes it an excellent choice for players with high swing speeds who are chasing distance rather than forgiveness.  The SIM2 Max is a higher launching driver that allows you to achieve mid to low spin rates but is incredibly forgiving. This makes the SIM2 a better option for low handicap players and the SIM2 Max the best option for high handicap golfers.