I was able to make my own sling strap that had similarities to the Bosstrap.
I could not find any strap that had everything I wanted and none of the extra stuff I did not want, so I built my own.
Very inexpensive, comfortable, and secure; but at least I don't have to wear advertising on my equipment. But then some people like to display labels. What ever floats your boat.
I think I spent a total of $12.00 and I ended up with a lot more material than I needed. Since I had control over the materials, the weakest link is the camera body itself. I could hang from this strap and I weigh a bit more than any DSLR
Consider DIY ideas if you like that sort of thing. You can often get better, more customization for a lot less. You can always put your own label on it if that's important.