I've been using the Garmin Fenix 5X
https://buy.garmin.com/en-US/US/p/560327 for about a month. I am impressed. Two features stand out for me: the integrated heart rate monitor and full color mapping. Although I enjoy my "traditional" watches (e.g. Sinn UX), the Fenix 5X will likely supplant all others.
On the upside, this is a great watch if you're into fitness of most any sort. This thing tracks "activities" from bicycling to trail running to golf. The user can access a variety of reports using the "Connect App" on a phone or tablet. Most cool, and useful.
The GPS nav feature is also outstanding. I can do pretty much everything on the Garmin Fenix 5X that I do on a full-size GPS. Think saving current location, navigating to a destination, back tracking, etc. I have read on the interweb that it's possible to download additional (e.g. topo) maps to the Fenix 5X. I've not tried that.
In addition to the above, the Fenix 5X does all the stuff that "smart watches" do - alarms, text message alerts, etc.
The watch seems to hold a charge well. Charging is done by a proprietary cord. I assume this was necessary to make the watch water proof.
On the downside, the thing is expensive - about $700. It's also a bit bulky. I've caught it and banged it around a bit. No signs of damage thus far though.
For further info, I suggest DC Rainmaker's vids on You Tube:
https://www.youtube.com/results?sear...nmaker+fenix+5.
From the Big Empty, ELN.