My Dad has an A6 Mastee. Was working perfect and about a year into it they botched the FW and it no longer recognizes his DAC.
Its a know issue with several other DACs. It's been over a year and no resolve. When I asked for an RMA 5 days before the warranty was up they stopped communicating....
Decent hardware , terrible support and FW . Its had about 5 updates, each one had issues.
Bluesound is a much better platform , it may not have all the bells and whistles but it works for the most part.
Anyone spending $2k to $4k on an Eversolo is nuts.
I had a chance to use a WiiM Ultra and I would choose that over the A6 .
Any potential buyers should read the pages of problems over on the Zidoo forum.