no idea about jiffy hitch, (never seen one in person)... but normally quick hitches in general. you may need to modify various 3pt hitch implements to work with a quick hitch... which may mean, redoing a pin or holes.
make sure ya pay attention to the jiffy hitch pictures. the top link on the 3pt hitch = a hydraulic cylinder.
it looks like a nice setup. but i would question how the "locking mechanism works" from jamming up, to 3pt hitch implements you are not able to get lowered just right, and not able to undo the lock.
i question the extra cost of needing another "triangle" for each and every new piece of 3pt hitch equipment you want quick hitch ability. it would be awesome if manufactures of 3pt hitch equipment. had a jiffy hitch / delta hook option. vs a direct 3pt hitch standard hookup. but i don't remember coming across implement style like attachment options.
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the upside down U shape quick hitch setups. don't require to by extra triangle or other stuff. just the possible needing to modify 3pt hitch equipment to fit the quick hitch.
i would imagine the upside down quick hitch setups out there. would benefit more with a TNT (top link and one side link replaced with a hyd cylinder) vs the jiffy hook setup. but issue is still how good of a full connection happens. when implement is all skewed and at different angle. than how you backed up tractor.