Hi, a proud owner of this wonderful DAC/AMP combo. Very powerful output, can drive my Sony Z7 at ease with high gain @ 50% vol, and also those power hungry planar. I notice no one posted internal pics of this beast (unless i missed it). So here it is (anyone want components name or hi-res pic, you can PM me). My unit has a flat head screws, I actually had a earlier unit with pentalob? screw, a bitch to open it.
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I also replaced stock WIMA caps on my own NX4DSD with something more classic to suit my taste, Nichicon UES caps. Made this beast even better. On iFi counterparts there are only those small SMD caps so I cant tinkering with, a minus for iFi and big plus for Topping

Anyone with brave steady hands can even replace those tiny Opamp with something else or modded a socket into it for big and easy opamp rolling (SOIC-8 to PDIP-8 socket)