Just want to add my 2 cents on the digital vs analog volume pot:
The last time I used a digital volume pot that is similar to the C5 was on an old creative mp3 player about a decade, since then I've either used analog volume pot, or digital wheel.
Right now, I'm using the xduoo xp-1 as my portable amp, together with my S3, and I find myself wishing it has an analog pot, because when i stick them into my jean pockets, 90% of the time, I will accidentally twist the volume knob. Either that or when i'm walking, the cuff of pocket will rub against the volume knob, turning the volume up and down, up and down, as I walk (yes it's as comical as I'm making it sound). So in this instance, the digital volume knob will be better for me, as it has a smaller profile, so there's a smaller chance of me accidentally bumping up or down the volume.
Another reason I MAY (have to actually try it out first) prefer a digital volume pot, especially one with many steps, is that it's easier to adjust the volume for iems that require fine volume tuning (it's hard to finely move the volume pot mm by mm to get your desired volume when you're walking fast. I had this very problem this morning). Adding to the fact that the on-off switch is also the volume pot (turned to the lowest volume to switch off the amp) means I have to finely adjust the volume pot every time i switch on the amp.
Since the C5 has a separate switch, I hope the amp is able to "remember" the volume setting when it was last switched on. This means that I will not need to fiddle with the volume setting everytime I switch on the amp, and I will not be bothered by the "harder to use" volume pot problem that everyone is so worried about ( I'll just take my own time to adjust the volume, then not bothered with it again). Of course, if you use the C5 with a variety of iems, then this won't really help you. Does anyone know if this is the case with the C5, because I don't remember seeing it when reading the product page, or blog post.
So to me, I see 3 additional advantages with a digital volume "pot" compared to an analog one (besides the channel imbalance issue): Smaller footprint (good for portability), less possible accidental changing of volume, and easier to make fine adjustment in volume. YMMV.