got the money for it, just waiting for the retail version. I checked the home base of hifiman and their is heated discussion all over 901.Now a few hardcore hifiman users exchanged their old 801 with the new 901,plus 400 USD. As far as I know , there's still a long list of 801-901-exchange users not getting there 901.
Any one know when 901 will be shipped? I noticed that Fang Bian said it'll be march in the recent headfi TV, but you know, he also said 901 will be shipped in September 2012 a long time ago.
If you want to know the details about 901, you can ask me, I didn't got one but I went through almost every thread in the hifiman home base(www.erji.net), perhaps I can be of assistance