Like a few other reviewers have already described here, the in-ear headphones deliver a really beautiful sound and in my opinion also rich bass. Through the essays in different sizes, they offer comfortable fit and secure grip at the same time. Through continuous use (almost every day over a few hours), however, in spite of careful handling, unfortunately none of my Sennheiser in-ear headphones for more than 6 kept to 9 months (cable breaks).
Since I am better Sennheiser accustomed me this circumstance simply disappointed and angry, but I am satisfied with the sound, the bass and the comfort, 3 out of 5 stars.
-> Who with a shelf life of 6 - 9 months can not live at this price, should look elsewhere prefer.