After a fine tooth comb inspection, there are no other problems on the machines at all, everything else is perfect.

My concern is what you do not see. In fact, wiring is so thin that you can go with fine tooth comb without any problems. What used to be 18 gauge standard went to 22 and now Stern is using 24 gauge China wire which is less than half the 18 gauge thickness. The China wire is cheap and breaks very easily. This is probably OK for casual home use but it is a nightmare for operators which is probably why you do not see too many in the wild.
A big concern is how good will these wires be in say 10 years time?
As Pete also says, the Qld humidity will wreak havoc on metal and electrical components. Sydney is not much better because we often get the left overs of the sunny Qld big wets. Vic machines will probably be the most sought after in the future.