The W3KANV are not for everyone. They have a particular sound, one that isn't agreeable with the masses. I've yet to hear them from a good rig, but from my initial impressions, I would tend to agree.
Also - my comparisons/review of the TH-600 vs TH-900 are almost done, if anyone is interested in buying a pair of TH-600s, let me know. I'll have a FS post up in a few days if not.
Look forward to reading them. Have established can demo the W3KANV and TH900 but no TH600 unless the shop springs a surprise on me. So no way for me to know what the scale is for the extra £ (checking Pricejapan, the additional postage, import and customs fees hardly makes the resultant saving worth the effort, might as well support UK businesses). Would also be interested to read your thoughts on the Mad Dog vs the TH600