I'll open with a dumb question, since I just received mine today: does it come with a screen protector already on? I went to put on the one that came with it, then realized there already seems to be some slightly raised surface on the screen that might be a protector, with some very slight bubbling around the edges, but I don't want to pick at it to find out for sure.
A more detailed manual would be nice for people like me new to DAPs - some of the menu options aren't immediately clear.
Minor software issues:
The "Hi-Res Audio" section just lists the songs on the device which, correct me if I'm wrong, only seems to check for sample rates higher than 96khz, with bit depth being irrelevant. There's no way to sort by artist or album, so it's not very useful in its current form.
The equalizer doesn't work on 96khz and higher tracks, but the user can still control the toggle (it just has no impact). Ideally this should be grayed out if it doesn't work, or a message should appear, since it's a bit confusing (that said, I generally keep the EQ flat anyway).
While this player obviously wasn't designed specifically for english and that's totally cool by me, smaller font size options would be a little nicer aesthetically so that single words aren't divided across two lines (for example, in the drop-down menu, "System" shows as "Syste" with "m" on a second line). The constant (very fast) horizontal scrolling for long file names when scrolling down a list is also a bit dizzying and I wish there was a way to tone that down a bit.
Wireless connectivity, something I never really cared for when transferring files to my phones, works really surprisingly well and is very fast - you can upload files via the upload tool or by simply clicking and dragging - but there's unfortunately no way to preserve the existing folder structure from your PC. If you try to drag a folder to the device, it will simply just copy the audio files to the root. You can manually create and name folders on the device via the wireless interface and copy files to there, which is something, but it's still a bit more trouble than it's worth in its current form, unless you don't really need a folder structure. Cable connection's still the way to go for now.
Again, I'm nowhere near as DAP/DAC experienced as most people here, so take my opinions on the sound with a grain of salt, but outside of the minor little things, I'm really happy with this thing so far. It's going to be getting a lot of play over the coming weeks, so I'll report back with any issues.