Great - perfect for the gym and lifting.
I have had the JVC explode and Dr Dre beats ear buds and these are the best, not by much...
I had Dr Dre beats ear buds for a while and they had great bass, but poor mid range and treble, plus they used to always fall out my ear when squatting or dead-lifting - frustrating when you need the bass to get you through a lift! They were quite durable as I just used to throw them in my gym bag and there was no sign of damage. But eventually the washing machine got them.
The JVC had better bass than the Dre beats, but unfortunately the cable arrived exposed so they had to be returned. They felt tacky, but still good for the gym.
But these Sennheiser are outstanding. I have had them for about a week and the bass and mid range is far superior to either Beats or the JVC buds. They fit so perfectly in the ear and so far they haven't fallen out during training which is a massive bonus for me. Lastly, they also feel so amazing in ear too. The other two buds used to trap air and give me an ear ache after a while, but these are really really comfortable. Well worth the extra money when compared to the JVC and now the beats seem distinctively average in comparison.