Correct, the heat pump is primarily more efficient for heating. If it's anything like the Leaf's heat pump, it's slightly less efficient for cooling.
On a 40 degree F night (cry for me, I live in frigid Los Angeles) my Volt's resistive heater would pull 3,500W of power easily and absolutely decimate EV range. The Soul uses about 500W to accomplish the same thing. It's a massive improvement and I love having the heat pump.