Pros: Sound and build quality
Cons: Nothing glaring
First off, this was my first real headphone, coming from 40$< consumer Sennheiser/Sonys
Since then I've listened to many others, and these are still great in my mind
BUILD
high quality, durable, and comfy 
Cable is great, and they look good...wish they had more color schemes though (black is boring), these are a really attractive can
SOUND
Fairly neutral, with a slight bass emphasis, not boomy or sloppy, but not as tight as it could be. However, tightens up when properly amped (used the schiit Asgard). Still, sound fine unamped.
These are monitors, not supposed to be super colored sound, however this allows them to be completely non-fatiguing. I've listened as many as 8 hours straight, no problems.
Drive well straight from Ipod or computer sources. Really this could be used effectively as a portable, they are light enough anyway.
CONS
Probably not neutral enough to be a good monitor, but they are great for enjoying music!
CONCLUSION
Seriously, 100$
runs circles around the HD280
Does everything(music,gaming,movies,portable) pretty damn well.
Probably the most versatility for your buck.
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