Currently I am using this asus zenfone 2 for about 5 months and it is running very fine without any lag and heating problem. Its a very nice phone to buy for those who r the freaks of gaming and love gaming all day long. It also comes with a very good camera to take photos even in sunlight and even in low light. Its battery life is also good for using it all day. Its screen size is also good for playing games and watching films and videos. The price point is also good. The charging speed is also good.