I've had my Z2 for 5 days now. All I can say is how disappointed I am with it. The battery life is awful. The stamina mode which is supposed to save battery is flawed and doesn't actually do a thing. I'm not sure if it's the phone or android but the operating system has bad glitches. For example it kept opening and closing apps the other day. Today I turned up the volume and it just kept making the sound as if I was turning it up continuously. On both occasions I had to restart the phone. The phone also really heats up, something i've only had before when charging and using an iPhone at the same time. I really should have got the galaxy S5 or iPhone 5s. I know for next time!