These are the HD 598s. As you can see, these are eccentric-looking: people either love them or hate them. I tend to move towards uniqueness and distinction in every aspect of my life - music, appearance, knowledge, etc. - and owning these headphones is no exception. I'd hate to be forced to buy a headphone that looks cliche and doesn't take any risks at looking great.
Notice my name? The HD 598 is like a nimble turtle. Its laid back in sound - slow - but it sounds faster than all the other Sennheisers (which were just too slow for me). Okay just kidding. What I said just before was all BS that I just thought of on the spot. There's some truth to it though.
I usually lose my appreciation for the various objects I have. The HD 598 remains an exception. I use these everyday for movies, gaming, and music. This is the most diverse headphone I know. Music wise, you cannot help appreciate its wide soundstage. I knew before I got these headphones that I needed something that could do well in the classical genre, before everything else. These fulfilled my wishes and BEYOND. These are absolutely fantastic for alternative music, acoustics, jazz, R &B, etc. A little slow for metal but considering its sheer diversity, I am impressed. Overall, I've never heard a headphone that is able to balance listening fatigue and engagement/ excitement as well as the HD 598.
Despite its "mid-fi" status (a biased expression among head fi'ers imo), I would consider any future headphones I buy to be a sidegrade compared to these. These are one of a kind headphone, and you can tell how much I appreciate them.