I have a covert black 60. Love it for video (with sound)
I also have a couple mp6 red flash. If I had to choose between the two I would go with another mp6 as I am more of a picture guy then videos. The black 60 takes pick but can be blurry.
Not sure if its a black flash issue? Im also probably going to try a red 40, from the pics I see off those, they got the mp6 beat which is already real good on pic quality...
Hope this helps.