Must add my +++ to Topping.
Bought a D50 last year and its given me excellent performance. £170 at the time. Its replaced a benchmark DAC1 in my 2nd system
It does benefit from an external power supply but Topping now provide one. Just ordered a D10 USB dac for use in my workshop, should be here in a week or so.( £64)
Sound for your pound, Topping gear is +++ but prices are rising
Pity we weren't talking about a British company