Ok so I bought the LG g3 yesterday and I am loving it. The screen is gorgeous without any complaint.
I loved the screen-off effect from knock-on and I have the Black hole effect. However, it worked right after I bought the phone, but I changed some settings here and there now screen goes on and off with knock-on, but it does not give the screen off effect.
Lock screen mode "Popping colors" changed the way it works on my phone, recently. When I press the power button, the lock screen background comes with some kind of fly-in effect. Then, when I swipe the screen first it has fly-out effect and then fast fly-in effect and only after that - screen unlocks. It made me went crazy.