I have one - in my opinion it is the best "Y" type strap on the market. The only problem is that the entire weight of the leica is hanging off of the bottom plate (which I don't entirely trust due to the design). That being said, I would rather have the camera hanging from the bottom plate than by a single riveted strap lug. When I use my BlackRapid strap I actually string a "jumper cable" made of parachute chord from the BlackRapid tripod mount attachment to the closest strap lug - that way, if the bottom plate somehow manages to pop off, the strap lug will catch the camera before it becomes one with the pavement (and as a bonus I don't have to worry about dropping the bottom plate when I change film).
Overall quality of the product is great and it is very fast to use (due to the fact that the strap anchors into the tripod mount, leicas hang in a near perfect position when using this strap).