Very interesting thread and thanks to all the very knowledgeable posters. I live in Ireland and currently use the ODAC but need another DAC for my main rig in attic. The topping DAC looks the job.
Will it work with Linux and where can I buy it from a trusted seller?
you can check you can check on eBay or Amazon I'm not sure if in the UK they sell it on Amazon. But yes it works just fine on Linux.