Our friends at TechCrunch have covered the Kenu Highline! Here's a taste:

"So this is the Kenu Highline. It’s basically a locking connector, a coiled cable, and a little loop. You lock your iPhone to the cable, attach the loop to your jacket, and go totally nuts. Attach it to anything. Your jacket. Your bropurse. Your 7 Jeans with the big, tribal stitching. Anything"

Read the review at TechCrunch