I almost sprang for the v1 Watch, but waited for the Garmin Fenix 5. It's a far superior product IMO. Garmin is actually really good at designing interfaces for small screens, and t has buttons instead of touch, which I wanted. The battery lasts almost a week (long enough that I don't think about charging it, I just kinda plug it in when I notice the battery indicator below a quarter, which happens not very often). The heart rate was the big feature for me, plus the sapphire crystal (scratches on watch faces drive me crazy), plus the focus on fitness tracking, built-in GPS + GLONASS, and looking like a regular watch while being rugged enough that I don't have to worry about bumping it into stuff. The Garmin connect app works pretty well, with only occasional inabilities to sync. The Suunto Ambit 3 I have previously was much worse in this area. The app syncs with HealthKit and Gyroscope and generally works well for doing what I want with a fitness tracker. The vibration alerts also work well and remind me of meetings even when my phone is sitting in the dock on my desk and I'm working with headphones on.

I think that the Apple Watch really needs some killer features and excellent usability to separate it from the rest of the pack and drive sales. I see all of these smart watches as 5-year-max lifespan products before they're hopelessly obsolete, so spending half a grand+ on any of them is not going to be appealing to the masses.