Not to mention the unstable Bluetooth connection and which of course does not reconnect automatically when the phone and bracelet are nearby ...
And to top it all (yeah it's not finished) phone users other than SONY, go your way ...
They made the choice to give more "features" to Xperia owners like the ability to "sense" your movements (journey made by car / bike etc ...).
Sony thank you for your seriousness and commercial choice to sell your line of phones ...
Just for interested that I did these tests on my Nexus 4 Android Version Lollipop (official, no root)