Ok, so at this moment in time i'm an iPhone user (4S), but i'm planning on getting the Samsung Galaxy S4, when i mentioned this to my iPhone, Windows and BlackBerry user friends, they all replied saying "Don't do it" and "Android is full of bugs and laggy as hell" But from what i have seen in YouTube videos, the Samsung Galaxy S4 seems fast and very responsive. Is this just how Android is perceived or are my friends in fact right? I want to get as much information as possible, before i go out and spend ?579 on a device that i will also be keeping for 2 years (just like i have with my current iPhone 5S).