The j series is tremendously awesome either be 2 5 or 7 while j7 hot high in fame board last year and hence we got the new version of it with 2 gb ram and now the prime with 3gb ram it works very well and due to high clock speed processor it does multitasking well the battery backup is very good with 3300 mah battery the screen and display size is little more than the one which can be handled easily by anyone sound quality is good verdict is if you want high speed go for it