MSB DAC's Popularity

Hello All,

I would appreciate some insight on the above. I'm in the market for a DAC with volume control and am exploring the Discrete or Premier. I question the lack of reviews and even dialog on AGon? The limited reviews that appear portray stellar performers; however, not many exist on the used market. Are they so good that no one sells? Or, is the price/performance not commensurate and nobody buys? I do love the future-proofing built into their designs! Could you please share your experiences with those who own or have auditioned? I'm looking for an end-game product, if that is even possible in digital. 

Thanks!