Pros: Excellent sound - lively, dynamic, natural. Built in headphone amp also very good with certain headphones like HD800, LCD-2, HE-500, etc
Cons: HP amp has unwelcome background noise making it unsuitable for sensitive headphones, output impedance is also weird.
NuForce has an interesting history of success. On the one hand, they became famous on the strength of their relatively high end amps and preamps. They still sell plenty of models in their "reference" line, most of which cost at least several thousand dollars. In more recent times they seem to have focused on the opposite end of the market - the budget end - and have achieved success there as well. Products like their HDP, the various Icon compact amplifiers, their NE series of IEMs, and of course the uDac, have cemented their place as a popular maker of affordable gear.
Toroid is by Noratel, who also supplies Benchmark for their DACs
Xilinx Spartan FPGA
AKM digital receiver towards the bottom, AKM DAC on the left (sorry for the shadow)
Front panel PCB including separate Xilinx chip