Alternatively you could use camera with long exposure times...
Any digital device that films at 24 fps has a great chance of missing events that are milliseconds long. On the other hand human eye does not have refresh rates and you will always see the flash and in its most developed shape.
The night vision catches those better because it has the afterimage effect by design, similar to human eye.
The vortex one does not seem all that effective, on a side note and it's similar type to the one MX uses on photograph.
I think Booster's footage shows what happens once in a blue moon when stars align and your refresh rate is in synch with the flash at its peak magnitude.