Interesting connectors, they allow you to see the wire and even pull on it before you complete the crimping and cut off the excess. I have never used them. For me crimping Ethernet connectors is a boring and tedious job which I do when I have time to kill. I have found pretty much all connectors work with the crimp tool I have but I do not know if it is just sheer luck. I have even managed to crimp without the tool, just pushing the pins in one by one with a flat screwdriver.
What I hate is lazy people who do not properly secure the outside plastic sleeve, only the wires, and the wires break after some flexing. Arghhh...