Shane Wheelwrote a review of Garmin Fenix 5X Sapphire on August 2, 2017
Familiarity: I've put it through the wringer
I upgraded to the Fenix 5x from the Fenix 3 HR. I've been using the watch quite a bit, both for training as well as backpacking. The new topographic maps feature is quite nice and I'm really enjoying the route building feature for running... when it can find a route more interesting than just out and back.
My biggest concern was the changes in battery performance, but to be honest I haven't really noticed much of a difference. During normal day to day wear I'm going a week or more without charging the watch. During backpacking trips, that I'm using the GPS for a good part of the day, I might need to charge the watch every other day or so.
The size is the only downside that I have at the moment... It's not a small watch.
I would definitely recommend this watch to anyone that's looking for a bomber GPS tracking/navigation watch with tons of training features an great performance feedback.