D200+ and Zishan are separate companies and different engineers, different UI, different digital processing. D200+ does not have usb dac or eq. D200+ is charged by usb. The switches on bottom were only on the old version, D200+ only has one switch on the bottom for changing between single ended and balanced. I have ordered 4497 D200+ and will receive it in a couple weeks. Also 4497 is very different to 4490, very different classes of dac, ak4490 is entry level audiophile dac like wm8740,cs4398, es9018k2m, while ak4497 is flagship level like es9038pro.