The great thing about the polar is that you can be paired with their Bluetooth chest strap for more precise reading

it's slower, the battery doesn't last as long, and the most inexcusable thing to change was that Google took away the shuffle option in Google music

The only good thing I can say is that I have some idea of the calories I've burned and the general range of my heart rate throughout a workout.

Can display the data you want (particularly good for the lap screens).Android Wear- 2.0 does some less good things with the interface, but overall it's good.

Personally, I'm still getting used to the smart watch thing, but not sold on the hype yet

A nice things is the watch will show you EVERY notification that arrives on your phone no matter what app

The nice thing is that the fitness data always syncs -- it was hit or miss sometimes with the band (and my wife had similar issues with her fitbit).The Polar HRM is much more reactive than either Band or the 360 was during interval training.

My husband that absolutely refuses to go Apple loves this thing

However, in intervals shorter than 30 secs, the m600 can miss things, not getting there before the interval is over, for example a quick lifting set, or a vinyasa (in yoga, a jump-plank-pushup-up/down dog-jump move, dynamic, heart jumps 15-20 beats in 10 sec).

Too thick, about the same as a G-shock- Alarm