Good job pye !! I'm done with youngnuo they are nice flashes don't get me wrong , however I won't never ever use them for weddings or events yes they failed on me , misfires etc .. and also went full youngnuo adding the 622 s as well and I shot a whole wedding and failed on me I was getting black bars sync problems misfires ... you are so right about the radio waves and people made of water your so right I also was using the neewer flashes and again same issues .. I know sold everything that reads youngnuo and went back to canon 600 ex rt and bought some lumo pros as my back up lights and I can simply say there simply reliable they just fire at all times , rugged, bought back my pocket wizards 3 never will turn back is just works simple .. youngnuo and any other 3rd party flashes etc there are only good if you are in control environments , studio, outdoors etc .. but when you are doing a wedding that a bride and groom paid thousands of dollars you don't want to be the culprit do yourself a favor get the real deal !!! Great video pye !! Your 100 % right great great flash they are really build like a tank I mean literally well build !!! Great job !#!