I am sure that these are the same type and manufacturer cinch buckles that I carry and use for all my hangs. To me they are the fastest, easiest and probably the strongest way to go.
The manufacturer claims that these buckles have been tested up to 1200 lbs without showing a scratch. Although they could not produce the test info at the time.
I believe it though since they are stamped out and don't seem to show any weak spots or seams. Hopefully I will have a chance to test them myself soon and come up with a reliable breaking strength that can be documented and posted.
Meanwhile, I will continue to use these everywhere from back yard hangs to cliff hangs.