1. The sound quality is excellent. High and mid frequencies for this segment are very good, do not merge into a mess at maximum volume. All the genres that I listened to recoup the column with dignity. Rock, metal did not listen, but I'm sure everything will be fine. Regarding low frequencies, I will compare it with Flip 4, which was earlier. The flip gives a fairly powerful bass at low to medium volume (with the bass mode turned on) and it really feels like it comes from the speaker (I like it more, but only in certain genres). With Sony, the bass seems to fill the room, dissipates. He is more "noble" or something, not intrusive. Yes, and I understand that such basses are suitable for many genres, in contrast to the flip, on which it was possible to listen to the norms mainly only low-frequency genres, and even then not at full volume. However, something is missing in terms of bass. Apparently this is what the reviewers mean when they write that there is not enough dynamics.
And further. 7.5 W is the power of the power supply (according to the Sony off site), not the sound. If Flip 4 has 16 W, then here, according to my subjective judgments, 30-35 W.
2. The light accompaniment pleased. On the street during the day, of course, it is better to turn it off to save charge, but in the dark it is definitely turned on - the mood immediately creates :) And this is not only a party one, because there are different backlight modes. For calm meditative music, you can turn on the appropriate backlight mode.
3. Style, design flawlessly. Waterproof. The buttons and controls are comfortable. Everything clicks, mates and acts as you would expect, with no surprises. The only thing I don't really understand is what NFC is for. Smart already pairs normally with the blue tooth, and NFC seems to work only with close contact . If you know, write in the comments :)