I'm currently looking at getting another pair of headphones, but am undecided between the Sennheiser HD25s and Amperiors.
Uses (in order of highest to lowest priority):
1) Mixing with a Pioneer DJM400 mixer -- mostly dubstep / bass music, psytrance, some techno..
2) Use as a semi-portable headphone to listen to music at work
Previously for mixing, I had the Pioneer HDJ1000s which I didn't mind, but they were a bit uncomfortable after long periods of time. I heard the HD25s years ago, and quite liked them. I've also briefly sampled my dad's Amperiors and thought they sounded okay, but I didn't get to listen as much as I would have liked.
Here, we can get the Amperiors on special (I guess due to being discontinued) for $200. HD25s are still around $300. I like the idea of lower impedance of the amperiors so I could use them as portable headphones. My concern is surrounding how the lower impedance impacts the sound, and whether they would be suitable to use for mixing? Also would there be issues of driving them too hard and causing damage?
All the people I know who mix have previously sworn by the HD25s, but I haven't yet come across anyone who has used the Amperiors for mixing and can comment on how they compare to the HD25s.