i'm using the 10 awg version of this. Anything above 12awg will have problems working with a standard wire terminal cap (apparently they're designed for 12awg or smaller)
while the quality of the knuconcepts speaker wire is excellent, the design that makes it so good makes it a pain to work with. the outer shielding that holds the pos/neg wires in the twisted position makes cutting to expose the wire difficult because you risk cutting the wire itself. For this i used a small screwdriver to seperate the outer coating and a small pair of scissors (or an exacto knife) to cut away the outer insulation.