These are the best headphones i've ever own and will own. In terms of sound quality they beat 60pound pairs by far. There is no comparison whatsoever between these and the sennheiser PX100s/200s. I've owned all three and the kosses destroy any other headphones i've had. The quality of the sound, depth and clarity of the bass cannot be overstated. I would urge you to buy two pairs as I have done. Believe me, NOTHING compares to these they are simply phenomenal. I'd pay 50 pounds for these at least. For 17 pounds you'd be blind not to buy at least one pair. Cannot describe their awesomeness, superior to all headphones under 100 pounds, and i've tested a lot! BUY NOW you will not regret it!