First of all the earphones are damn awesome but its stock buds ( the rubber on them) are stupid so you have to change them to a thick buds then it will give a badass bass and good noise isolation otherwise its not possible with the stock buds. I have been using it since 1 year. And you should only buy it if there’s a authorised Sennheiser service center in your city, because these earphones comes with 2 years for warranty. After 1 year my earphones stereo was just swapped I mean the right earphone was working as left earphone but they were working fine.