Really pleasant to use and entertaining.
You can listen to music and play a game or write a text message in the same time! I think the principal strenght is the thousands of applications you can download for play a game or find a place when you are in a different city; find a restaurant; the map of the tube; or everything you expect.
The weaknesses I noticed is some bug sometimes; For example I was playing a game and the apps closed suddently; And another day the screen became white and I had to wait my phone passes off completely to be able to relight it and it worked completely normally.