Two main problems with the Xperia Z for me: Poor battery life and ergonomics. I found the battery life to be pretty bad even with power saving features on; I suspect this is because of the fHD screen and the quad core processor. The screen quality also isn't up to the level of the competition, but I've become accustomed to this. And I found it too large and uncomfortable for everyday use - sharp angular edges which digged into me, especially when it was in my pocket. So I bought a Sony Xperia SP which, although a step down in specs is still fairly respectable: http://www.gsmarena.com/sony_xperia_sp-5364.php It has a larger battery and I'm finding it to last a lot longer doing typical smartphone tasks; and this phone is smaller - although a little heavier - so is much more comfortable to use, especially in my pocket when walking outside. Here it is next to the Z: I like the transparent notification bar: The SP has Gorilla glass and an aluminium surround; the removable back cover is plastic. It feels very solid and of good construction - like the Z but different materials. So, I've no use for the Z anymore...I'll keep it around to see what Android 5 is like, but the SP is better for me for everyday use.