I stopped wearing a watch shortly after I started carrying a mobile phone (~1994) as the phone could tell me the time and date, and I had to keep it charged anyway. I didn't see the point of carry a redundant item such as a wristwatch. Even now I see 'smart' watches as nothing more than gimmicks.

I have a mechanical wristwatch, and love it. Scenario: I want to know how long something lasts (e.g. lunch)

Wristwatch:

1) raise arm 2) pop crown 3) twist crown to align hands at 12:00 4) push crown 5) twist crown to wind

And now I can view at a glance how long it's been since I set it.

Same function with my smartphone:

1) dig smartphone out of pocket 2) press power button to activate screen 3) swipe my unlock figure (sometimes twice because it doesn't register correctly) 4) tap clock app icon 5) tap timer tab icon (out of three extremely similar-looking icons, sometimes tap wrong one) 6) tap 'reset' then start icon 7) press power button to deactivate screen 8) put smartphone back into pocket and everytime I want to check that timer: 9) dig smartphone out of pocket 10) press power button to activate screen and the timer's displayed.

Twice the effort, thrice the hassle.

I picked up a Casio W800-H (similar to F-91W) about a year ago and I'm really loving it. It's holding up pretty well despite regular abuse at the gym and while working on my cars.

While I'm hoping to get a couple of years out of it, at <$20 it's great for a daily driver!