What Hi-Fi? give this release a full 5 ⭐ for an amplifier that "sounds so good that it should be your electrostatic headphone drive amplifier of choice". SoundStageAustralia adds a Stax headphone heard through the SRM-700S "challenges even the best of speakers and set-ups with their accuracy and life-like performance".
Also think about building a pseudo-full size earspeaker system with SRM-700S operating as a pure power amplifier. Front your system with Benchmark Media's DAC3 and HPA4 – Head-Fi's most precise pre-amp volume control – for that. While you're reading up, browse all Stax's other offerings here, or our other DAC/amps here.