I haven't ordered Harmonies yet... but another note... make sure you test out the little "key" into the hole that you use to tighten the join. On my Options that I've had almost a year, I went to use one cord that I hadn't taken out of the package yet...the "key" didn't fit into the hole. I contemplated having dh ream it for me, but of course emailed KP first. Per their excellent reputation, they mailed me a new cable. I am notorious for not throwing things out, but of course, couldn't find my order slip.. but still, no questions asked. I have as many details as I could recall.
So, in summary, check the holes