Just got the BTR7 today. After firmware update and playing around with it for a few hours, I'm really impressed with it so far. What a well-built device. Solid, looks and feels good, and most importantly, sounds great. Haven't run into any issues so far. This is exactly what I was looking for to pair with my phone and OLED TV / Apple TV 4k. Need to test the Bluetooth more but it pairs quickly with my devices and it hasn't lost signal yet unless I make changes to the Bluetooth codec in the FiiO Control app.
After using the BTR7 plugged into my PC via USB-C, I definitely need to upgrade my current DAC/amp. The BTR7 simply sounds much better. Repeating myself again, but it's too bad the BTR7 doesn't have the ability to bypass the battery because it definitely gets very warm after using it for a while. I don't want to keep it plugged in to my PC for too long because I don't want the battery to die prematurely.
I think I'll be waiting for the KA7 to release and see if
@FiiO Willson can get FiiO engineers to add line out and MQA to the KA3's design, and maybe add more functionality or inputs.
I might buy the Hiby FC4 for $60 for the time being. Not sure yet.