A review of the JDS Labs O2+ODAC DAC and headphone amplifier has been published, offering a closer examination of the device. The product is being compared to other portable amplifiers and headphone amps, with some outlets discussing related topics such as op-amp rolling and reviewing similar devices from other brands. The reviews suggest that the JDS Labs O2+ODAC is being considered among the best headphone amps, although the exact ranking and comparison to other devices is unclear.