Upgraded from Garmin's Fenix 2 to Fenix 5 because the former is no longer holding a charge

It's a signifcant size improvement over an already excellent form factor. It won't be long before these watches are dimensionally no different than conventional watches.

For me, though, the most important improvement Garmin has made is dramatically extended battery life. This is the first watch I can actually wear as a watch and not worry about needing to charge it before my next run. (After experimentation, I learn I only need to charge it once a week as long as I don't leave it connected to my phoone)