BRA reduces head-cappers substantially, by taking the AC20, UAC20, LBX20, GR and HGR (except at close range) out of the running (and AC10, LBX10 for crit). But still has cERPPC, HPPC and cHLL that can headcap, and the 10 damage laser/PPC weapons will penetrate.
Plus LBX it rounds to a minimum of 1 (so shotgun does full damage, but slug half damage). So isn't as effective against that. It also doesn't give crit resistance.
Decent, but that is a trade-off. (I know, why not take the BRA Hatamoto-Suna against the Viking IIC hardened, see how it goes. 2086BV for the -Suna, 2780 for the viking, so make the -suna a 3/4 pilot (2,878) and fight that battle. GR and MRM20s against a ton of LRMs. BRA vs hardened).