Quote Originally Posted by SmartWombat
It's claiming to do things that just don't seem possible.
For example my Canon, when a flash is attached, will not allow me to select any shutter speed above 1/250 second.
So there is no way that the radiopopper can overcome that.
Hi shutter speed flash requires multiple flash firings as the shutter opening travels across the film or sensor frame. I suppose it's possible that this do-dad can manage that, but I'm skeptical.

Still, they make the claim. I suppose a field test is the only way to find out...