I am not going to go into the audiophile technicalities, mostly because I don’t have the knowledge or equipment to run all those tests and they really don’t matter to the average person. What I am going to tell you is that the Sennheiser HD-280 are excellent headphones. Highs and lows are reproduced accurately and cleanly. You can hear subtleties in audio not present with other headphones.
The design is perfect. The leatherette ear cups are very comfortable after hours of having them on your head. The single (and extra long) cord is appreciated and the whole set up also flips up within itself to make it somewhat portable and keeps everything nice and tidy when not in use.
While not exactly cheap, I feel the HD-280 Pro provide some of the best bang for the buck when it comes to headphones.