[Abathar]

I watched an episode of Future Weapons where they tested that stuff, he must have put 40 or 50 rounds of all calibers into it without a single thing going through.

They then took it out on an explosives range and stuck the dummy on top of a grenade and popped it off. It tore through the outer lining, but when they took it off there was zero penetration through the vest, the inside of the thing still looked brand new. I haven't seen the Army's stuff tested like that, but to me it sure looked like it did a heck of a job stopping everything thrown at it.

[Ben Mugged]

I saw this too. The rounds were always coming straight towards the armor, not at an angle. If a round came from an angle that was aligned with the overlap axis, I just bet it would penetrate.