The Amazfit GTR4 is also quite nice, with a crisp display, multiple physical buttons, and weeks of battery life. However I found it became unpaired from my phone every week or so, and I didn't feel awesome about entrusting my GPS-based location to a company that I don't know/trust. I also wanted better music controls via the physical buttons, which it didn't really do well.
How did you hack the BIP, and what did you do with it then?