I ordered a pair of Mad Dogs (w/ dog pads) a few weeks ago. I've never listened to a pair of unmodded Fostex, so I don't really have a "fair" basis for comparison. Actually, having never listed to any headphones sporting planar-magnetic drivers, *ANY* comparison I use to judge them would be unfair. I only have expectations that are wholly built on head-fi raves and hype. Based on that alone, when I first listened to them, using my iPod and E11 setup, I was very disappointed. To me they sounded weak, had muddy lows, and presented an awkward sounding hollowness in certain vocals (especially on the Adele tracks I listened to). After about 45 minutes of listening, I tossed them back on the box and put my ES10s back on. Happiness.
A few days later, convinced I must be missing something, I plugged them into the Yaro desktop amp I use at work... I was rewarded with a completely different, and completely favorable, listening experience. They still couldn't hit a volume that even came close to "uncomfortable", but I had no problem achieving a very clear "listenable" volume. Yesterday I returned to the lower 48 and finally hooked them up to a Nuforce Dia I recent bought my son. Volume can no longer be considered "an issue" for me.
It turned out running 100% digital signal through an amp capable of providing more-than-adequate power to my Mad Dogs put a huge grin on my face. Listening to DSOTM (24bit/48kHz) I was able to clearly and distinctly hear detail that had escaped my in the bazillion times I'd previously listened to the track. I checked; the ES10s reproduce it but much weaker and with much less distinction. And, I had to listen multiple times before I could say for certain I was hearing it. It might just be the drastic difference in isolation but I'm impressed, regardless.
Yes, I think I'm really going to enjoy these Mad Dogs.
And now I absolutely must listen to a pair of high-end planar-magnetic headphones. This hobby/addiction/sickness is going to put me in the poorhouse someday. I just know it.
Okay, back to lurking.