FlyFishNutwrote a review of Garmin fenix 3 on September 28, 2015
Familiarity: I've put it through the wringer
Upgraded from the Fenix to Fenix 3 and haven't looked back. If you are a geek then this watch will give you a lot of data to pour over. I'm not a geek, but still love the user friendliness of this watch to customize screens and even download unique faces and parameters from the internet. Veddy Cool.
For the "Jack-of-all-trades" this is THE watch. I trail run, whitewater kayak, backpack, mountain bike, flyfish in saltwater marshes and the list goes on. For gym rats you can even measure your spin class stuff or treadmill crap (ugh).
If you are only a runner or tri-athlete this isn't the watch for you, but if you engage in a LOT of various outdoors activities this watch will meet your needs.
My ONLY complaint is that mt biking in the thick woods it doesn't mark distances super accurately. Running doesn't seem to be a problem and maybe this is something Garmin can fix with an update.
Go out and get it done - on the trails, on the road, in the woods, in the marsh. This watch will serve you and all those pursuits well.