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The big challenge for devices like these are the combination of battery capacity and size/weight.
I think the Samsung Gear 2 gets a lot of things right when it comes to features though:
Camera
Microphone/Speaker so you can place/answer calls
IR-transmitter for controlling things like your TV
Fitness-things like heart rate monitor/step counter
Internal memory for photos/music and so on
Notifications (e-mail, texts, Facebook ++)
It is however in a device that I personally find too big for using as a 'watch'.
I have the smaller Gear Fit which omits a lot of the major functions from the Gear 2, but is much more 'watch'-like in size.
After only a week I am getting quite used to getting notifications from the phone on the Gear Fit, and I think it is a great idea since I rarely walk around with the phone itself on me at work or home - it stays on the living room table or at my desk, very often with the sound turned off.
It is one of those things (much like using a cell phone with a large screen) that you don't really miss or see the need for until you have tried it
