The sound quality on this top notch. The treble is crisp and the bass is pounding (with a nice punch). I've tried out different types of songs from different genres, seems to get better each time! I've even tried it on acapellas, with great results. The clarity of the voice is clear, and not in the way that it is too sharp that it becomes irritating or hurts. The bass when it thumps, have a strong punch to it that doesn't crack.
I've read reviews where people have complained about the headphones clamping their heads and being too tight. To be honest, they are fine on my head, perhaps its because i have a small head (lol). I can see slightly where they are coming from, i guess the sensible choice for some people would be 'try before you buy'. Also, i was worried that the ear cups would not cover my whole ear and sit over it. I was pleasantly wrong, it covers it perfectly with a nice snug fit. Perhaps after a few hours of use, it may hurt, but the easy solution is, to take a 10 min break, every 40 mins. The 3 metre cable depends on the person. Some like short, some like long. If you like short, you can just use the clip provided to shorten it. There is also a strong, sophisticated looking leather carry case also provided, with sennheiser embedded on it. Before i forget, they come with gold plated connectors, which is amazing.
For £29.99, you honestly can't get any better. You can't find quality like this, at this price, from any other company. The sound it produces is far superior than any other £29.99 headphones out in the market. The headphones are also extremely well built, and looks expensive with the shining sennheiser logo on the side. Well done sennheiser, 5 stars out of 5.