I've had these headphones for just over 6 months now, and they've done me good. The bits in the retractable headband have snapped on both sides, rendering them useless now, so I've had to go and buy a new pair of headphones. :( I had this problem with my last pair of headphones as well, which were the Skullcandy Terje Nine headphones, so it looks like this is a problem associated with most of the Skullcandy range.
But this is a great set of cans, especially seeing as they're less than £30!
The sound quality is brilliant. I was actually able to notice distortion in some of my lower quality MP3s that I never noticed before. If you play your MP3s at around 128kb/s, you'll hear a loss of quality that you probably won't notice in cheaper headphones, like the ones that come with an iPod. But listen to them at 192kb/s or above, and these headphones will reward you for having your MP3s at high quality.
The bass is good and hard on this set. It's also not overpowering, so it doesn't feel out of the mix with everything else.
One of the best things about these cans are the way it blocks out external noise. You don't have to turn your MP3 player up too loud to surround yourself in your favourite songs. These headphones sit comfortably around your ears, and do a great job of isolating you from the outside world. A little word of warning if you've got big ears. You might find them a bit uncomfortable when you've got them on. My ears are slightly bigger than normal, and I had a very slight discomfort with them. The earcups are designed to support normal-sized ears, so if you've got big ears, you'll find it a bit of a struggle to get all of your ear in the cup. For me though, it was very very minor. It didn't make me uncomfortable, so if your ears are only a little bit big, this shouldn't put you off.
Overall, these are an excellent set of cans. They're well worth their £27.99 price tag. They deliver great quality that you'd normally expect to pay around £100 for! Just treat them carefully if you get a pair, because if you don't, they will break. If you fear about them breaking on you, look at a pair of Sennheiser headphones, but if you do, be prepared to spend a bit more for a pair of the same quality as these!