I got my hands on some today and was able to watch some being fired and fire one myself.
Not a scientific test in any fashion. Marker was not chronoed or properly sited but it flew fast and true for a long distance.
All I can say is that I want to get my hands on enough that I can site in my weapon for 100plus feet and shoot as a pair of gogs at that distance with both regular balls and these and see what happens.
Swamp