Its nice that Android gives you the choice to change your lock screen, however I have tried most of them and none of them work very well at all. For instance: The most common issue is the lock screens don't show up instantly, if you unlock your phone and then within a few seconds lock it again, you will be able to bypass the lock screen altogether because the lock screen would have not loaded yet. Another common issue is so many of them are hit and miss when it comes to your applications or software features. For instance: The HTC One M8 (and I also believe the LG3, there could be more) have gestures to unlock your phone, and whenever you install a replacement lock screen these features half the time don't work. The only gesture that ever seems to work on these replacement lock screens is the double tap to turn on display, that it. Now I know some issues can be solved with rooting your phone, such as being able to turn on gestures, however a general user - such as myself - will see those lock screens in the top apps on the play store, and try them out. If we need to root to get these to work, then the play store has failed in showing us content that we can use. Plus rooting is very much a hit or miss, I don't like to try the process because A) its Complicated and B) Its very easy to screw it up. However, back to the point, these lock screens do NOT require root so why are they all so buggy, and more importantly why is the stock or skinned lock screens, such as HTC's, so stable? These things never fail to work. Why can't lock screen replacements be as stable?