I have used the insulated die and the heat shrink die. Insulated works great but the heat shrink die did not properly crimp the wire in the disconnect after three tries. I was able to crimp that disconnect using the insulated die set. I am still not sure if the problem was with the disconnect or the crimper but I will say that after checking the disconnect following the pull test failure it appears to me that the disconnects are rather cheaply made. The connectors are 3M HEAT SHRINK WIRE CONNECTORS MARINE ELECTRICAL WIRING MALE FEMALE SPADE
