This is the far end of the light/fast vs heavy/slow argument. Super light bullets like this will expand very violently, but is VERY likely to UNDERPENETRATE. This can, and likely will, fail to penetrate deeply enough to reach vital organs, especially on a larger target or one wearing heavy clothing.
I would not recommend this ammunition for defensive carry
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball