Absolutely loving this thing. So much more mature as a platform than the AK70. Almost flawless UI with only the occasional stutter, but even high end Android phones are not immune to that. The inclusion of Spotify and Tidal just elevates this thing to a whole other level. For casual listening on the go, Spotify is my go to so this is awesome. I connect the AK to my phone's hotspot and I can control it over Spotify Connect which makes hassle juggling multiple devices on the go much less. Similarly, AK Connect seems much faster in response times than before. I don't have so much experience with DAPs, but it's much better than the AK70 or MKII, no comparison. Key sound quality strengths (I only use SE): low frequency extension... this one goes as deep as it can , but very controlled bass. non fatiguing / non digital sounding high mid/low treble. As my wife said: voices sound real now (compared to AK70). The PP8 can be a little hot in this critical frequency region for fatigue and the SR15 somehow makes it much smoother to listen to over long periods. May have something to with higher output impedance, will have to measure that. Wide and deep soundstage. Definitely much better in that respect than the quite narrow sounding AK70. I might try to do some measurements next week or the next compared to AK70 and AK70 mod.