About as good as they get without breaking the bank. These have a very wide open sound stage. Rich mids, strong highs, bass is solid too. Being open back you can also hear whats going on around you, which is great if you don't like being shut off from the world. The downside though is sound leaking... if you're playing something loud, people around you will hear it too. The build quality is excellent, as with most Sennheiser headphones. The ear pads are plush and soft with a velour type material. They breath nicely, unlike my Sony bluetooth headphones that make my ears over heat. All in all, an excellent and happy purchase.