I use mostly my Xiaomi mi note pro with viper4android. I also have a Qls 360 and a DX100/DX90. Tried a few other sources as well but the Solar sounds great with everything that I have tried It's not very source picky.
I have had the QA 360 for a week now and I have to say it sounds very neutral. Like it way more than my DX90/100. I find it to be at the same level as the Calyx M but its more neutral sounding and easier to handle. The only negative thing I can say about it is that it does not support 24bit flac. And maybe that it can only read two folder deep.