Flash Change may be a misnomer. Certainly isn't faster than pushing the button on a Devlieg Jigmill for the power drawbar, and changing tools in a few seconds. Getting the flash change adapter oriented correctly, the 1/2 inch hex key in and breaking loose the toolholder takes WAY more time than using the drawbar. I've used the flash change adapters on my Excello double end boring machines, that have a manual drawbar, and they save time. Certainly in my fifty taper machine with the drawbar mounted on the top of the spindle housing, the flashchange IS a real time saver. I have used these for twenty years, HAVE a Devlieg jigmil and would never consider using one in the spindle, the power drawbar is super quick and it doesn't care if you're using flash change toolholders
I may have a forty taper flash change adapter. I was buying all of them for awhile.