iBasso platform is archaic. Since 2016 they have been using the same hardware platform, and the same PCB (!), except the amp. MAX even has the DX220 main board with an a larger amp connected. There is nothing wrong with that but it is not where it ends. Since 2016, they didn't even care to properly clean up their pull down menu system. "Location, auto-rotate, airplane mode, hotspot" menu items are still there which don't make any sense for a music player - it makes sense for mobile phones only, and there is no shortcut to USB DAC mode, gain etc. It might sound like small a small thing, but for me it just shows what kind of an attitude they have to the customer. They completely ignored my emails and questions, too.
I think there is also some shady relations going on in the background. It is a hype train. I was wrong to jump on it, not because MAX sounds bad (actually it sounds pretty good), more because the whole community is a cult rave kind of experience. No matter how they sound, I will stay away from them. That would be my recommendation to all other, too.
I appreciate the FiiO experience now even more. I am also waiting for something, for the DAC mode with Linux to be fixed, but in general FiiO is a 1000X more professional company.