razordogaudio is also selling it at this price(msrp $599 - their site wide $100 off for everything beyond $399). The funny thing is they do NOT provide the $100 promotion for B stock and B stock is listed more than $500, so you will pay more to buy B stock than a brand new and B stock one is actually sold...
Back to the main topic - THANKS FOR EVERYONE'S HELP HERE!!! I just got mine yesterday from Amazon(1 day shipping). The out of box first impression was amazing!!! Beautiful wooden cup(I was choosing btw TH610 and TH900 as right now the TH900 is only $450 more at Adorama, but I am really not fun of the red color, although it is the selling point of TH900). The details(something that I never noticed by using my ATH E70 IEM can be heard now) and openness of the sound are also impressive. I do NOT feel the bass is boomy and V shape is not prominent as I thought. It sounds really neutral for me and that is what I like.
One question I have for folks here. There is one unboxing video for TH600 at youtube and the reviewed said the cable was attached to the phone, but mine has the cable detached, in a separate taped plastic bag. How are yours?
BTW, the SN is really low 700-ish, so it seems Fostex has not been able to sell them many, probably due to THX00. Many reviewers recommended THX00 over TH610 due to the price difference, but now it is only $100 difference and less actually(you do not need to pay shipping from both Amazon and razordogaudio, but from Massdrop).