I got my Arrow 5N today! The amp is awesome (I have the 4G too), but the nicest surprise was the DAC and the little microusb to microusb cable included. I hooked it up to my Galaxy S5 (running Neutron) and it is FANTASTIC. Took a little time to test the bass boost options (EXTREME BASSHEAD style) and the Bass set on II, with M setting, really made my SZ2000's rattle. Love the instant mute by pressing down on the volume knob. Compared to 4G, there's only one headphone output vs two previously, Bass boost gets frequency options (L, M, H - I believe "Low, Medium, High") and the crossfeed option is gone (who uses that anyway). The charging is switched from miniusb to microusb, and DAC is added (with Off, PC, or Mobile options). Also the Gain button switched location from bottom to top next to the volume control, which is good.
I only wish we could get more technical details (what dB boost do the Gain settings add, what frequencies does the L,M,H Bass boost affect and in what shape)