I've tried and owned virtually every pair available that falls below $300. I narrowed my choice down to 2 pair; the Sony MDR-7509 and the Sennheiser HD 280 Pro. The difference for me was that the Sony (this applies to all Sony headphones, too) sounded very good, but in the way that a good home theatre sounds. Just too much hype; good to listen to cds, movies, walkmans, etc but not to work on. The Sennheisers were "closer" to the sound of a set of studio monitors. They fit snug and comfortable and feel more solid than the Sonys. They do have some hype, especially with the low end. And they're more power hungry than the Sonys, so you'll have to run your output to them hotter than you would on other cans. As others have pointed out, you'll never.....NEVER......do a real, complete workable mix on headphones. When I say the Sennheisers are good, I mean from the standpoint of writing, edited, just working on tracks or critical listening to stereo fields or panning and having things relatively close to mix conditions. I frequently work at night either editing or writing/sequencing. Using the Sennheisers and listening back the next day ( I always have to allow time for my ears to relax after using headphones) through the mains to where I left the project has been surprisingly close! I never, ever got that close on any other phones including the Sony's, AKGs or Audio Technicas.