I have to disagree; I've been tying my own D-loops, I use 500 pound parachute cord change when I need. If some KNOWS how to tie one they don't slip.... I've been shooting long before compounds were popular and I've never had a D-loop failure, and I guarantee there isn't many people that shoot more arrows a day than I do.
Nice product, and I'm sure they will do fine, there are a lot of people that can't even put on strings and cables on their bows.