In some details my review reads quite negatively. However, this should not affect the conclusion. The player has some minor weaknesses, which should not deceive the overall summary. I just want to avoid that people will purchase the Opus #1 and afterwards complain to me about smaller issues.
Once the music is neatly stored, either on folders or perfectly tagged, you have a relatively pretty player that delivers clean power to headphones. It does not distort anything and does not create any superficial wow experience – in a positive way. In addition, the battery finally lasts really long and does not need to be charged twice over the weekend.
If you use streaming services or have become too accustomed to gapless playback, you might be better advised to buy an external DAC for your smartphone.