I have the 4. I regularly use it for most of my music listening (when travelling or working out + bluetooth headphones), Transit tracking apps (here in Toronto I use RocketMan for the most part), use the NHL app to follow scores if I'm not watching the game (not often now that the Leafs... did what the Leafs do...), Maps (on occasion), and news apps—Apple News, News360, and AP. Oh, and the Weather Network app which can also feed a live temp. reading to the watch face (handy in the winter, especially).

Personally the biggest boon for me is workout tracking and health data. It's transformed me over the last six months or so (girlfriend said it changed my life—though that is a bit extreme).

There's even a VO2 max estimate if you track a run or walk outdoors for more than 20 minutes.

Actually I just use it for many of the things I use my phone for except for writing long messages, email, or web browsing. Which is kind of nice. I put my phone in my bag and forget about it most of the time when I'm on the move. It's been good that way.

So I'll end there because I'm sounding like a sales pitch. I wouldn't push anyone hard to get one, but for me it's been fantastic.

Edit: For anyone else reading this comment, my biggest complaint would be battery life. I won't get more than 2 days out of it without charging because I use the battery-intensive heart rate and music functions regularly. Resolved of course by charging it nightly beside my phone.

Watch app's I frequently use:

- AutoSleep: https://itunes.apple.com/app/id1164801111 or Sleep++ - https://itunes.apple.com/us/app/sleep/id1038440371

- HeartWatch: https://itunes.apple.com/us/app/heartwatch.-heart-activity/i... I much prefer this complication to Apple's. It displays the most recently recorded heart rate measurement

- Dark Sky: https://itunes.apple.com/us/app/dark-sky-hyperlocal-weather/... I also prefer this weather complication and watch app

- Overcast: https://itunes.apple.com/us/app/overcast/id888422857 Great watch app for controlling podcast playback, and includes the option to go phone-free (with AirPods).

- WorkOutDoors: https://itunes.apple.com/us/app/workoutdoors/id1241909999 If you go hiking outdoors, even infrequently, this app is great. It allows you to store trail maps on your watch, and optionally record workout of your hiking (with GPS data, etc).

- Baby Monitor - https://itunes.apple.com/us/app/best-baby-monitor/id43279139... Drop an iPhone or iPad near your sleeping baby, check in on them from your watch (with notifications and optionally video). Not sure if you have kids, but this app is a bit of a marvel, especially when out and about or traveling.

- Fantastical - https://itunes.apple.com/us/app/fantastical-2-for-iphone/id7... I prefer this app to the built in Calendar.app, both for iPhone and Apple Watch. The complication is great, especially in the larger sizes.

Of Apple's built-in apps, I frequently use: Messages, Now Playing, Walkie Talkie, Workouts, Maps, Activity, Wallet, Phone, and Music.

- Deliveries - News - NY Times - Starbucks - Stocks - Mail - Homekit - Carrot Weather - United Airlines

and a weird checkers program are the ones I use most. But I don't have the fancy new Apple watch. I have the original one, which is much more limited than current models.