For most recreational resort skiers, a "Good" moisture wicking rating is perfectly adequate. It moves sweat away from your skin effectively during normal cruising runs and moderate-paced skiing, which covers how the majority of skiers ride. You'll stay comfortable through typical resort days without overspending on premium wicking technology.
The main tradeoff is that during your most intense runs—like bombing steep moguls or racing your buddies—you may notice slight dampness against your skin. On warmer spring days, that feeling can be a bit more noticeable. However, once you ease off and catch the lift, most skiers find the garment dries quickly enough to avoid that cold-chill feeling on the ride up.
If you're an aggressive skier who runs hot, tours in the backcountry, or skis hard all day every day, stepping up to "Excellent" wicking is worth it. But for casual to moderate resort skiing, "Good" hits the sweet spot between performance and price.