My reaction when I saw the price was that I would have to see it in flesh, and reflect long and hard.
I bought three of each of their Leash and wrist straps when I bought my current lightweight gear. I found their early connectors would jam after a while, and bought replacements. They are up to version 4 of their connectors....good reasons for each change. However, their no longer useful to me on one camera because the connectors are too large (again.)
So I shall wait. Many others have subscribed to this product. Good marketing.