I have the FHF harness and love it. I've had no issues with buckles, but did have some stitching start to unravel on the straps that cross behind your shoulder blades. Simple DIY repair. Mind you, I use the harness for work too, so it sees 150-200 field days a year and is now about 4 years old.
As compared to the other bino harness systems, I selected this one because it seemed less bulky and I like the idea of supporting a small time entrepreneur who is also a hunter. I don't believe there is a superior product to be had elsewhere.
Since you seem to be having issues particularly with the male buckles, consider doing an online bulk purchase next time you break one. I did this when I made a boat blind. If I recall correctly, there is a shop in Seattle that sells webbing, tent fabrics, etc... that has a comprehensive assortment of buckles and such.
Good luck!