Many thanks Simon for your detailed response.
Generally just frustrated with Sony, in that they bring out the two devices in the UK UDA-1 and ZX1, but the Sony WMC-NWH10 is not available. So the best use cannot be used unless you've bought your device from Japan.
I'd like the PHA-2 but its not available yet in the UK.
I already have some expensive old missions that 'may' sound great with the DAC, but its expensive to try when all the other HiRes devices are showing up.
Its 5% off today, so I am dithering about whether to buy or hold out until Sony show their hand with the other HiRes devices, so I can choose the one that suits my needs.
I mainly listen via headphones and Squeezebox touch and dragonfly dac, but something that could do both and improve the Sony DA2400ES (don't laugh) sound that I have today, which I am sure it will do.
I'm in a quandary too now, reading about the Oppo HA-1 ( and finding out there's 5% off the UDA-1 today. Totally agree about frustration of availability of Sony products !...for example the speakers - SS-HA3, not being available !!