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@TooTallTim
Those ones on eBay are almost certainly fakes, if you compare the smaller oval shaped holes they're not the same as a legit SRAM one
However, you will notice absolutely zero difference in performance. In fact, two friends recently bought £5k+ eMTBs, which came specced with the same £10 rotors I'd bought on eBay. They were a bit miffed, but quickly realised they work identically to £45+ rotors so it really isn't an issue