hmm, well until I see scientific stress tests between the various versions (i've read about and seen multiple failures of both BR and copycat versions), all I'll say is good luck with your single point of failure, which fundamentally, is attached to a point on the camera not designed for what these straps are using it for.
Seeing as it sounds like you are an engineer, maybe you could rig up a stress test and prove us all wrong.
I'm a retired engineer now, what I did was to give you a heads up based on many years of experience of product failures in many applications. If that isn't good enough, then like I said - good luck - it is your camera after all. Good luck trying to get your chinese seller to give a toss after taking your money too.
Your comment about the tripod mount design? They are way tougher than you realise - check out the way sports photographers carry heavy lens/camera combinations on them all day every day. Do you see them falling off? I wonder how many have el cheapo screws holding them together...
Such is the effect of stress raisers, you could get an inferior metal to out perform a superior metal if it is made correctly.
Agree with you here lamar, for some things, i can see that spending the money is worthwhile, but you raise a perfect example with Nikon own brand battery grips there. If only the third party manufacturers in the battery grip arena were as reliable (AFAIK) as the manufacturers in the strap market.
Also, if you buy a Quick Strap, you help the British economy. If you buy BR, you help the American economy. So I guess the buyer can support whichever country they think needs their money most! ;)
Agreed about cost of battery grips, but not about any one country's economy - the best quality gets my money wherever that comes from. If the BR fastenR-T1 hadn't been good enough, I would have made my own.