Andrew Everard from What Hi-Fi? reviews the M2Tech HiFace Dac:
“The M2Tec HiFace DAC is a little USB stick, is bright orange, sells for just €220, and yet is capable of handling the highest of hi-res music files you can buy. This I had to try…”
Andrew Everard’s conclusion:
“M2Tech has built quite a reputation for engineering-led value-for-money products pushing the limits of digital sound without ridiculous price-tags, and on this brief audition I’d suggest the HiFace DAC could just turn out to be the company’s most significant product to date.
And even better, in that embarrassing moment when someone says ‘Is that a high-end digital-to-analogue converter in your pocket, or…?’, at least now you’ll have an answer.”
Click here to read the entire review
Dé Durob Audio blog - Le Blog de Durob Audio 
Attention hiFace DAC is not designed to drive headphones. The hiFace DAC is NOT a headphones driver: it’s provided with a line output which only gives a little current. This may be enough for certain headphones, not for all. When properly used (that is, to drive a preamp or an amplifier), it betters all competitors. The same can’t be said when it drives headphones. Marco Manunta