I'm skeptical...$128 for an all aluminum radiator that is likely a low production run? If I've learned one thing from buying and installing aftermarket parts (especially on ebay) is that there is no free lunch. Its likely cheaper than OEM for a reason.
But credit is due to taking the leap...you've piqued my curiosity.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red