I've connected 4 of these connectors to 2 different ethernet cables (of a good quality and solid core) and all 4 connectors had problems. After running both cables through my network cable tester I've found issue with various pins in all 4 connectors. I believe there is an excessive amount of space surrounding the pins to be crimped into the wires which is leading to the pins moving around and not connecting with the wires properly.
I've also found the metal shield very flimsy and weak and was taking damage and bending very easily through just normal usage.
I won't personally be buying this connector again, overall I found it low quality.