the thread starters of the three threads tkam linked to pretty much account for all the people who own or have owned the DX1000 on Head-Fi (as far as I know Jasonharkin is the only other person to own one, at least for a short while). I guess this makes the DX1000 one of the most reviewed headphones on Head-Fi, with three of four owners (AFAIK) putting up a lengthy post on them.
they seem to be a headphone with highly polarized opinions though, and that probably accounts for the lack of DX1000's on Head-Fi, along with its high price. my pair were at the San Jose meet and some people liked it, although that wasn't the majority opinion from what I can tell.
I agree that the price might be a bit high for the performance it delivers, but if you go by the Japan street price (which is around 80,000 yen to 100,000 yen) it is more reasonable than the $1200+ you pay through audiocubes.
despite their acceptance on Head-Fi, they seem to be very well regarded in Japan and seem to be one of the top picks within current production headphones.