Who cares about t 0.5 times? A child who doesn’t know what they are but knows shorter is better?
I am instantly suspicious of any flash company that quotes t0.5 times, the tail is always longer than the initial burst so a t0.1 of slower than 1/500 is nothing to boast about. My Einsteins at 1/4 the cost and more power are 1/360 sec at full power and have incredibly short durations off full power. Seriously, who is doing this set in TTL? I use ETTL when it is appropriate and think it is very good, but do you know the algorithm they use to reduce fill rating as EV changes? Nobody outside Canon does, you can’t do this stuff in TTL!
My point, that nobody seems to be taking up, is this, if your ambient exposure is 1/2000 sec then you are trying to mitigate a lot of light, to do that you need a lot of flash power to be brighter than that. I don’t know of an affordable system that can do that so I am asking, what, specifically, are people going to use to shoot with a 1/2000 sync speed?
I use ETTL fill flash with speedlites, sometimes in HSS to lower my ambient exposure, I use battery powered Einsteins outside. I have looked at all these systems and even have leaf shutter lenses, I still haven’t found a solution to provide enough flash light in situations where I need to use 1/2000 for my ambient exposure.