As a working DJ I've tried lots of different headphones with varying degrees of success. Sennheiser seems to be one of the most consistent manufacturers of decent quality headphones. The HD 270 is no exception.
Although not exactly cheap, I've learned that you often get what you pay for when it comes to audio equipment. The HD 270 fits snugly over my big head so anyone with a normal sized one should have no problems. The padded ear-pads cradle my delicate ears well and block out a fair bit of background noise. They are one of the more comfortable pairs of headphones I have used.
Sound quality wise, they are pretty good. Not the best, and for this price I would want to be amazed. The music sounds good if you are listening at home/work etc but I fear that if I were to use this in a work capacity, where performance needs to be that bit better, I might be let down a bit. The bass sounds good on these but I found that when turned up higher I struggled to make out some of the mid and high elements of the track.
Admittedly, I didn't use these headphones for hours upon hours but for the time I did wear and use them, I was impressed enough to note the model incase I needed a cheaper alternative to my main pair (to be reviewed).
For this money, I would expect things to be a tad better.