I have been using one plus X series smart phone for past 9 to 10 months. Which has 3 gb ram. So far the phone has never got hanged nor any other operational problem. Only one issue I have faced is sometime it has heating problem while talking.
Other than that Camera is really cool & super. I have not used any digital camera after I started using this phone. The picture quality is super. I haven’t seen any phone in this range giving such perfect camera picture quality as one plus x offers. I’m absolutely satisfied with this phone specially the camera of the phone.