I took this headphones from Amazone with a resgistered seller. After getting it I personally sent a mail to Sennheiser company only to check if the product which I bought is genuine, beacuse it is under warranty.
Sennheiser confirmed the product and seller is genuine and there will be no issues. Just after using it only for couple of months one side of the earpod got slow down which means one side I was hearing low sound and te other side earpod sound was really more.
As it is in warranty period I have given it for repair but with Sennheiser I didnt expected this small issue in such a shorter time. So my suggestion is if you wants to buy a Sennheiser product please go to a shop and buy but do not take risk of buying online bcz sometimes they give u genuine refurbished( 2nd hand) product which we do not know.