I checked out this strap very thoroughly, although i have never actually seen one in person. it looks pretty awesome. However, I chose the BosStrap instead.
Connection with a screw to the tripod mount seems a little dangerous to me. The BosStrap has a pretty unique design, and is extremely well made and comfortable, plus it's half the price....
check it out if you're interested. I've also read a lot of people say the metal pieces of Luma scratched their camera body.