Audio Research Reference DAC

Does anyone have any experience, opinions, comments on the performance of the Audio Research Reference DAC? How does it compare to other top end DAC's?
I've never heard the DAC, but it seems to get less chatter around here than other brands (PS Audio, Bricasti, Lampizator, Berkeley).
I had this dac for 6 months. I sold it as I am not using preamp,section of this dac. Too expensive as a dac. If you don't have a preamp, then it might be a good buy