I find that contrary to criticisms that have been made by some people this phone is really very pretty. It is better to see it in real life to make a judgment that merely see on the internet where it can sometimes seem ugly. However it seems quite fragile, therefore it is mandatory to buy a shell. It is a matter of survival.
The phone has tools to extend the life of the battery and optimize to better integrate the Xperia system. For example when the battery begins to be low it can automatically cut off the internet connection which is very energy to foster life of the simple phone sends sms / mms.
The screen size is good enough but I regret that the menu bar is found on the screen. It eats a little screen at once.
At the power of the device it is quite decent. I can play carefree Temple Run 2, Doodle Jump or Fruit Ninja but still feels he has limits. At the same time considering the price was to be expected. We're not in a very upscale.
The only real downside I found in the device is in the position of the volume buttons, which is not very convenient. Wanted a little trouble with the volumes of buttons. And when you have a shell like me it's even more so galley there is more than average.
As against the light button / unlock / lock which is identical to the Xperia Z is great. When the Photo button must be pressed a little hard to turn it on.
To conclude this is a good device. I even think that this price is the best in its class with of course a grant by an operator. By cons, if you want a free package offers without obligation as Free does not take that phone. There are better phones at the same price as the Nexus 4. But in any case in "traditional" operators is the best phone you puisiez currently find at this price.