Btw, bringing thread to its original target, I personally can say this DAP is one of the most intuitive I've used so far in terms of UI, both hardware and software.
It might not seems that straightforward to most, neither is a "rich" interface, but it seems as there has been a lot of "thinking" behind some solutions they come up with. I mean in particular the use of the volume wheel, the long press behaviour of buttons, customizable behaviour when lock is on... all very straight, plain, simple, direct.
Apart from sound capabilities, where I do not want to enter to, in general I consider this DAP "essential", "effortless" in making music flow out, and "lean" and "straight" in terms of use.
It's a pity it is a bit "choosy" on file format and cue parsing, but in general I do think for the price you can find it now it is still a good buy.
Finally, I am using it together with the B1s (when home), and I really love the symbiosis...