Disclaimer: I am not an Audiophile. I just received my US Amazon A105 last night, and I don't know if this is a common knowledge or not but the AVLS (volume limit) is toggle-able for me and it was off by default.
Wow. An Android 9.0 in THAT SIZE?! To me that alone is definitely worth the bump in price from the A55 to this. But again, they are completely different animals so it isn't fair to compare them. I am pairing this with my newly purchased MDR-1AM2 and nothing else and let me tell you it sounds incredible! I tried Deezer HiFi, and I barely cranked it up to around 78. This is exactly the device I've been looking for, about damn time Sony releases an affordable Android DAP. Thought I'll never see the day.
Now, the elephant in the room...battery. Everyone here was more than kind to provide detailed information about battery use and I am not adding anything to that except for the fact that I have a charger everywhere I am sitting during the day, and while charging continuously is a little bit disheartening but for this price, size, and sound I cannot really complain. The perfect device won't exist for me but I am going to enjoy the heck out of this one. I just wish we got more options in the US in terms of colors. Oh well.
All in all this little guy is going to be put to work in my car, in the office, and at home. I hope Sony will continue to optimize it by pushing updates regularly because honestly for a heavy listener like me (who isn't an Audiophile) this is a keeper.
PS: Spotify is my daily driver because I love discovering new artists, and their algorithm seems to work well with my taste as of late (I just recently switched from Google Play Music after using it for 8 years) and it took about an hour to download my 1500+ liked tracks on my MicroSD for offline listening on the go.
PPS: If you want to add a new flavor to your Android experience, toggle the Invert Colors option on, I find it quite fun-looking "filter" lol.