Anything wrong with PS Audio DirectStream DACs?


I'm counting right now 19 (nineteen) PS Audio DSD DACs for sale (new and used). Strange. Some second owners also selling... The reviews are unanimously stellar.

I wonder why.
cbozdog
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How old is the current hardware model of the Direct Stream Dac? 
original version reviews start summer 2014. many companies do  hardware updates without changing model designation, not sure if PS has done this or not...
Beauty of firmware is avoid constant changing hardware.  

Funny @audiotroy description of firmware .  CLUELESS!!!!!