It is a nice and good looking watch.
It is much lighter than it looks, specifically because it is huge in size.
Now the altimeter is not very precise as far as I have experienced.
The synchronization works well even indoor.
The battery last forever if you keep short sleeves and if you do not use the automatic screen lighting when your arm is tilted. This is by the way an interesting option which unfortunately does not work too well, specifically when driving.