BP Se-i here.
A few comments :
1) 100 to 150 hours (break-in) is a must (it is horrible out the box)
2) A good power cable is very important (mostly to address the bass issue)
3) Ditto for a good usb cable
The BP doesn’t sound impressive at first glance like other dacs, it simply sounds right / natural and I realized that ‘sounding right’ is probably more important than the last bit of resolution (at least for me). If you want to listen to your system, it is probably not the best Dac but if you want to listen music…