Pros: Awesome highs and mids, accurate and responsive lows. I love the open ended ear design, it lets my ears breathe and helps acoustically just like it's more expensive cousins, HD 555 and HD 598 offer. These are definitely audiophile headphones.
Cons: The 3.5mm/6.3mm adapter is way too large. Maybe a problem in certain situations
Summary: I had to choose between this and hd 558 ,and after consideration i knew the 558 will take my expenses far ,with the requirement of amp and a new source dap to sound atleast good .Also it was very analytical,neutral ...not for me.
I don't know how it fares with different sources but i use it with a mobile[no amp] and it sounds good,but not so with my desktop[onboard].My motherboard is from 2009, so may be new motherboards can provide good output.
Pros: mids,bass,relaxing/indirect [not inside-head]sound,equalizes however you want.
Summary: I enjoy listening to music using these headphones. These are more or less neutral. Not for "boom boom" enthusiasts. These are meant for use in home as they are open so they neither block ambient noise nor prevent sound from leaking. If you want to enjoy listening to good recordings at home are on a budget, these are the headphones for you. They do need some burn-in period and may sound a bit muddy right out of the box.