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Apparently there were a couple of batches released that were out of spec, and to their credit Troy handled them well with replacements. They are referenced on several boards in the US such as M4C.Some of these rails were apparently branded Noveske for installation on Noveske Uppers, replacement was handled through Noveske. As I noted, this wouldn't deter me in the least, the company stands behind their product.
I'm running a YHM rail 2 piece it's not bad, if I was using a quad rail to defend my live then I would buy high end but for now there is nothing wrong with YHM rails for matches or target shooting.