Before Garmin release the Fenix 5, I was using my Garmin Edge 1000 to track my metrics for cardio, weight training and running exercise. I didn't want to purchase the Fitbit Surge, Fitbit Blaze, Garmin Vivoactive or Garmin Fenix 3 since these watches are either too sporty to wear for work or going out for night life. Yes, both the Blaze and Fenix 3 have more dressier bands you can swap but it is a cumbersome process.
The Fenix 5 Sapphire solve all that. I love the quick release tab which allow you to quickly change from a sporty rubber band to a dressier metal band. The HRM optical sensor works great as I have not have any issues some users are having with Vivoactive. It has as much feature on this watch as my Edge 1000 far as tracking metrics like HR, cadence sensor pairing, smartphone pairing, temperature reading, barometer reading, altimeter reading, compass, steps tracking, flights of stairs tracking, weather and so much more.
Yes, the sapphire model cost a lot more the the base model(not the base model is low price). But the way I see it, i would pay just as much for a fancy dress watch like Tag Heuer, Citizen Eco Drive, Mavado or Oakley which don't do anything close to the Fenix 5 Sapphire.
I found that the Fenix 5 has so many functions that it is hard to utilize them, The Quick Start Manual is nearly useless, except to identify each button's functions. The best way to familiarize yourself with the device is to watch online videos, posted by some users. It is not a user friendly device, where one can intuitively scroll through the menus and access the functions. I have yet to be able to utilize many of the functions I hoped to when I purchased it, like tracking cycling and skiing distance and elevation recordings. For now, it's a great timepiece, with a clear crisp display.