Never heard of them before. Looks interesting however.
I have a brand (sorry I don’t remember the name) that is a cross between these with the pins and the mounting style similar to Pat’s.
My and Pat’s do increase the distance from the tractor about 4” which can create an issue with PTO shafts being short.
The only concern for this design that I notice is if you have a low pin level on an implement especially if an implement should sink on a stand or falls from a prop some how.
I could not tell from the picture how the spacer bar is removed. If it is not removable, it may well cause interference with a PTO shaft.