I bought Knox chest guard from Qmoto. I got to try it for the first time last weekend at MotoTT track day.
While I can't give any opinion how well it crashes since I managed to stay up, I can say it wasn't annoying or uncomfortable. Just put between the leathers and your chest and forget about it and ride safer.
At $139 I think it's a good buy and offers good protection for chest and ribs. Especially with the street races coming up with curbs etc.
The only thing was, it took a while to get it delivered (about 3 weeks).
cheers
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