| If i were in the market for a pair of new discs. id go for a named brand as most are tested and have proved to be up to the job. These fancy no named discs on ebay are a no no. im sure they sell plenty but not for me i want a well known brand. who can tell you the specifications not a fly by night ebay seller. at the end of the day it is your life you are putting in their hands how does you loved ones go about making a claim against a seller on ebay. think about it. and buy genuine or at least from a reputable company.
To be honest i though the idea was to have as much brake contact as possible between the pads and disc. with the wavy design there is not a lot of contact as so much of the disc is removed to save weight.
Yes i know there are superbikes ect racing with these but im sure they didnt come from ebay. | 
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