If this is the Galac-Tac kit, it isn't ballistic at all; it's ABS plastic...
Also, I would not trust a trauma plate with gaps in the middle (i.e. exposing the heart and bronchial tubes).... I'd further be worried about rounds spalling (when the round hits and shatters into a billion tiny sharp metal fragments still traveling at dangerous and damaging speeds) from the angles of the chest armor as well...
But it still looks badass!! If it was a kevlar lid akin to an ACH, I could've seen my old CO TOTALLY okaying these for the Company!