Sony Xperia Xz has a non removable battery. the viewing angles of the display screen is not very great. low light camera performance is not very great. frimware glitches are very few. no out of box android 4.2 Jelly Bean OS. the device get heated up very fast when playing games for more than 10 minutes and also during full HD playback. it has poor viewing angle. it doesnt come with latest version android 4.2.