I can understand that, it can be cumbersome choosing tracks quickly, and things like making playlist folders shouldn't really be required. I personally like the design of the touch pad (make sure you wipe it over regularly) and the screen sure I can live with, but the actual UI and features went astray. In my eyes it's almost like they got the sound spot on, we all agree on that, and to me the build quality is far above average, but when it came time to design the actual UI and features that section didn't know What they were doing lol.
For example, the Rocoo BA I have here has the features C3 could of easily had, such as auto shut down, sleep, albums, artists, track selection, it resumes where you left of from the internal memory etc etc.. These are little things that C3 was capable of even with it's small screen, and even possibly could be added with updates but I just don't see any coming at all. So whoever designed the UI needs a good smack on the bottom, because they were 2/3 of the way there IMO