I have been doing some testing on some Cuben tie-out assemblies recently.
Hanging weights from a polyester grosgrain loop built into a 90 degree corner.
When I reached the 100# mark, this LINELOC 3 broke on me.
To be fair, the grosgrain was pulling towards 1 corner of the Locline 3.
The way that the cord was pulling, and the way the loop was constructed caused the grosgrain to bunch up on 1 end.
I built a new setup and made sure that everything stayed nice and square.
This time it held 100# without breaking.
However, there was a large amount of flex in the plastic, and it looked to be near failure.
I was using standard 550 paracord for testing. It began to slip through the cleat at about 60# of pull. This required a half hitch to keep it from slipping further.