No matter whether with or without

I had bought the device because it was always annoying when my flash (Canon Speedlite 580EX II) takes too long to follow suit, mainly for portraits and reportage, sometimes a second results later an even better reason, but then: too dark ! - Even with fresh batteries. For this JJC I decided, since the reviews were consistently good "does what it should" "Not as expensive as the original," I have to say: It's not what it is! There is absolutely no difference if I turn it on the flash or not! The Blitznachladezeit was one and the same-with or without. It was just loud a whir - that's it. Maybe it is broken - it is in any case back.