Ok, I'm a techie gadget guy. I'm also a multisport guy (cycling, hiking, kayaking, snowboarding, XC skiing, snowshoeing, etc). I like to have a gadget primarily for data-logging of my activities. My primary activity is cycling (mountain & road). Cyclists are data geeks so we capture speed, distance, heartrate, things like that. I had a really great cycling device (Garmin Edge 705) that didn't work so well for my other activities. I wanted a device I could have with me all the time (a watch) that I could activate data logging at a moment's notice. I also wanted bluetooth wireless uploads to my favorite sites (like Strava). Having smartwatch features on top of that was a bonus. I was also drawn to the Fenix 3 (over other Garmin units) for the looks. It's really a nice looking watch and as quality watches go $500 isn't out of line.
How's it work? Awesome. I wear it everyday in the office and use it to capture all of my adventures. Strava is primarily a cycling website but I also capture my fishing adventures there. There's also some features specific to fishing that I frequently use. I installed a solunar fishing app that tells me the best fishing days/times. Even more important than that (to fishing) is the built in barometer app that really helps me zero in on the best fishing days. Lastly, if I switch from using GoPro to Garmin action cameras I could potentially use the watch as a remote.
When fishing all I need to do is hit start and stop. Everything else with the data logging happens due to the magic of technology (when it's near my phone it uploads). It does also have limited mapping ability (track back, but no background map). I did actually use the track back feature to get back to a launch after getting lost in the fog one morning.
I could go on and on but try to keep my reviews brief. Certainly reach out to me if you'd like more info. 6 months into my Fenix 3 ownership I'm still a fan. I hope Garmin continues to evolve the platform. I really see full feature watches as the future of tech. (As an aside I know many will ask why not an Apple watch. Apple watches are toys and not in the athletic performance category where you'll find brands like Garmin and Polar).