Most benefits are in the area of clarity and crispness. I started out in digital with an Arcam Delta 70 player then later added an Arcam Black Box DA converter and went on from there.
Do you recall "instant improvement" from your first stand-alone DAC ?
After weeks of research I recently ordered my first external DAC. My system is modest by most accounts... Van Alstine SET400 amp, T-10 tube pre-amp, Salk HT2-TL speakers, WiiM Ultra streamer/DAC. It sounds very good to me... resolving, clear, excellent bass, mids, highs. Then I started reading and asking about streamers and DACs and it seems my system could sound better. So I did a lot of reading and ultimately ordered a used Merason Frerot with factory wal wort power supply. Now the anxiety of second-guessing my choice and what it will sound like in my system. Cuz there are no stores near me to demo DACS. Eventually I will likely upgrade the streamer.
What did you notice the most about your first stand-alone DAC... more clarity, richness, scary good vocals, extended highs, more airy highs, more and better bass ? Better soundstage and imaging ? All the above ?