This portable BT DAC is powerful enough to drive even difficult headphones. It is plug & play as soon as you connect it via Bluetooth from any device.
I have used it with various headphones and in-ear monitors.
I use Android and after unlocking some parameters through developer options for Bluetooth, I have permanently Ldac quality which is superior. The battery life is average and if you use the 4.3 port and the volume at around 30, it will last from 3 to 4 hours. However, it charges quickly and the duration increases by 2 hours when using the 3.5 input. The app is good and especially the equalizer is worth it when needed. The battery measurement in the app is not reliable, but through experience, you will learn how it works. I haven't tested it much through the USB-C port of the phone, but it definitely has slightly better dynamics.
As a BT device, which I use, it is dynamic with clear sound and lows, as well as better music reproduction.
IFI could be more explanatory in various parameters of the device's capabilities, so that they can be understood by everyone. Finally, I didn't like that there is no clip in the case where it would help.