Maxed, at level 88, Giant Shield gives 38% extra BR. It
MIGHT be useful, but only when maxed.
Consider the average BR 16 shield:
16 * (38/100) ~ 6. Thus, it turns a BR 16 shield into a BR 22 one, for 15 seconds.
Consider now SoSun BR 21 shield:
21 * (38/100) = 7,91. BR 21 becomes BR 29.
Don't know what to say, it might be useful when maxed, against INT, but only if you have the required SP. Also, as far as I know, using one of the shield series applies the cooldown to all of them. That's how it was at 80 cap anyways, I don't know, things might have changed now.
