When we hired campers they came with the D035 or the Hyland. Both very easy for newbies. Hardly thought about it at all.
Now we have the Sturt we are finding the Oz-Hitch a much fussier beast. First couple of times the boss had so much trouble unhitching (on uneven ground), he got out the spanner and took the coupling off the towbar. We are getting the hang of finding that perfect height where there is no weight on the hitch so we can undo it, but it is still fussy. Getting lined up and on also takes more attempts each time than the D035 ever did.
We'll perservere for now, but if we don't get better at it we'll look at changing to a D035.