The OChain has been around for a couple of years now. You may have seen it featured on the bikes of pro riders and teams at the Enduro and DH World Cups, and often bought with their own money. I have been lucky enough to be riding one since they first launched in the UK, and a few months ago I recorded this review.
Note: Since the review, Charlie Hatton (a previous Strength Factory athlete) ran one on his Atherton bike on route to winning World Champs, and the coveted Rainbow Stripes!
You can purchase an OChain here: