Not only are C. Viper's attacks improved by boosts, but many of them require boosts in play to be viable. This makes C. Viper very vulnerable when she's playing on the defensive.

Hidden Weapons, the Boost on Emergency Combination, is a great example of the "Battery Boosts" found on many cards in Street Fighter Exceed. Since fighters need Gauge to trigger their Criticals, just about every fighter has a way to make Gauge outside of just hitting the opponent.