I received mine today and talked to Tim about it a bit before I did a little testing.
I havent tried it in a bow yet but I think I may save it for kids bows. Unlike Gordans, when I uncoiled it out of the box it maintained a memory, I put it on my shelf over an hour ago and the glass is still way up in the air on the ends. Gordons drops flat and seems a lot stiffer.
I cut off 4" off each, applied epoxy to the sanded side and held it up the the light. The .040 ULS gordans I have always used was so clear I could even make out the details of the fine scrim in the middle. The KK Stuff is foggy and streaky all the way though the .040
This may all change when glued up in a bow with pressure applied but if you decide to try it out, use a light colored core for the test.