People's impressions of supercapacitor power supplies.
User reviews on older Ciúnas DACs & SPDIF converters. Battery powered but no USB isolation or I2S reclocking
End User reports on all battery powered USB isolated & reclocked devices including DAC, SPDIF & USB Hub
Press reviews on ISO DACs & Ciúnas DACs dating back to 2013
More people's impressions of USB DACs & SPDIF converters before USB isolation was included in the devices. Still battery powered, however.
2012 Press reviews on JKDAC32