I have some sincere questions on the design choices. For context, I own a pebble time (everyday wear for triaging notifications) and a polar watch (for exercise tracking). Also part of a cycling community where we swap exercise watches to try out what else is out there. I have found I always sleep in my polycarb pebble time because I forget I am wearing it - it is that unnoticeable.
1) Why limit Core 2 Duo screen to BW? Feels like a step back when the Core Time 2 will have it. Sourcing parts?
2) According to the blog, I understand the Core Time 2 is your (Eric's) dream watch, so not trying to rain on your parade but trying to reason about the audience you're catering to here. The heart rate monitor suggests that it can be used to track physical activity. But... no GPS, metal (heavy) case, and protruding sensor diminish the utility of the sensor. If you've ever run with a light watch, you'll start noticing how quickly metal watches fatigue the skin. I've slept with watches on that track my sleep (optically) and the protruding sensors always causes pressure points - similar to a pebble (heh) in the shoe. Having 30 days battery life, speaker, and better vibration make for a great gadget that doesn't need to be taken off... unless it is not comfortable.
[0]: https://www.polar.com/en/science/whitepapers Purpose built devices are optimized and companies that build they have domain knowledge. You've probably never heard of polar but they publish the science behind their features where as garmin has nice looking gear but has gimmicky features, like "body battery"