They have better ones too. I have this one (Sabre ES9081) also: Hifime Android DAC (ES9018K2M+SA9023)
It is better than the ES9023 in resolving detail, but only on good quality headphones and if you stream higher quality audio files (like Tidal Premium), or play FLAC files. I have ripped some of my CD's to FLAC and play them using the jetAudio app on my Android phone. But the ES9023 usb dac's are really great sounding for the price.