Would buy this in a heartbeat (pun intended) if it came with a heart rate monitor.
I had the first Pebble Time Round and it's my favorite smart watch I've ever owned, but these days the things I want from a watch are to tell the time and collect biometrics. Taking a step back in biometrics feels like a bummer. I also totally buy that it would increase the foot print in a way that would feel way less slim.