After sitting on the sideline watching various OEMs launch smartwatches I finally took the plunge and bought a Sony Smartwatch 3. I had considered the Moto 360, the Gear Live, the Zenwatch, the G Watch R and the Pebble. All other Samsung devices were disregarded because I don't run Samsung phone.
So while the SW3 is not the prettiest of watches here is what helped me decide.
Pros
Waterproof IP68
Good battery size
Up to date processor
Trans-reflective display uses less battery in idle, doesn't suffer burn in and doesn't present you with a blank display when in idle
Micro USB charging.
Slim Profile (added in edit)
Cons
Proprietary strap
No manufacturer companion app
Gadget (not jewellery) look.
The SW3 has GPS, WiFi and NFC hardware onboard but there are few, if any, apps to take advantage of them at the moment.
Now that 5.0.1 had been released for android wear, with better watchface support I have settled in to make a few of my own using Facer.
I turn the watch off at night, but am getting 2 days (6 am to 10 pm) of moderate use easily, and am normally into the third morning before requiring a recharge. When it is left on overnight it uses about 5% battery.
My most useful apps so far have been Wear Mini-Launcher and WearTasker.
Only had it 10 days, so still learning and discovering.