My guess is that the T-Pro is most capable and comfortable of the group. What that means in terms of real protective value may not be much. Knox has shown capable pieces, but it's unclear what is underneath the outside in that piece, and their pieces run the gamut in terms of performance. The Forcefield lumbar piece is not nearly as capable as their EN1621-2 Level 2 approved back protector, 15.8kN vs 6.5kN are the numbers I've seen published respectively. Impact Armor appears based on old 90's T-Pro pieces. The materials and construction weren't good enough to pass EN1621-2 then, and I don't think they would be any better than the current and new Forcefield products. Bohn, well, they've been known to lie about CE certification, steer away from claims of real impact protective value, and in general don't look to be anything but cheap foam in specs that may not pass the limb armor CE standard. I don't think you can rank these pieces based on any criteria that matters. None of them live up to hopes and expectations, and none may provide a real protective solution. It's not an easy place to tell someone to spend money on something that will not likely provide a better solution, but is only keeping alive the market for better option possibly down the road once a market is established and enough folks demand something that actually works, not just something that calls itself a chest protector.
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