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Eurocon-xxxx spouts a lot of rubbish. I have never heard about counterfeit CF DS, either from MFactory or any other brand.
I have an MFactory V1 which is 10 yrs old and no issues. I do track my car too. Some of the early MF V2 had balancing issues, but they were also sold thru Eurocon-xxxx who had a falling out with MF so take it how u will. I believe you can only buy the V3 (latest) one now which has some new locking tech that prevents the shaft spinning on the end cap (most common failure mode).
Have not heard anything bad about the YFCM shafts. The M3 owners here like JFiber which is another TW brand, many users here with no complaints.
Whatever u choose to buy I recommend you order directly from the manufacturer to avoid issues with warranty claims (if any).
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