At the San Francisco Bay Area Head-Fi meet this afternoon I met one of the guys behind the Woo Audio tables, who encouraged me to try my old AKG K-340 on the Woo WA7 amp at the table. He said he owns several AKG models himself including the K-340 and assured me it would perform very well. He tuned the source to a piece from Prokofiev's ballet Romeo & Juliet that has BIG powerful deep bass passages. I have seen and heard this ballet live in San Francisco several times so I know the effect of the particular scene in the opera house. The whole orchestra from top to bottom sounded terrific on the K-340, even the high strings which are usually the weak link (they typically sound scratchy.on my home system, which apart from the phones is not very good (old Yamaha receiver instead of a proper amp).
 
Then out of casual curiosity I plugged in a set of other phones that was lying next to the amp, which turned out to be the Sennheiser HD 700. I was taken aback. The sound was completely different. The orchestral instruments did not sound faithful at all. Lots of distortion high and low, some instruments unrecognizable. I wondered why the Woo staff would lay out such a cheap headphone to test their sophisticated equipment. Then later I looked up the price -- MSP $1000 and street price around $500. 
 
This was not a rigorous test, just a side by side comparison impression of two very dissimilar headphones on the same music and amp. But the proof is in the hearing. Anybody considering a purchase of this phone (or any other serious one, for that matter), should do his own careful research first-hand.