The screw clamping system works very well. The connectors fit together perfectly. And in addition the + and - symbols are carved in relief on the connectors in order not to disappear with time.
Incidentally, the sizes of the connectors are the same as those that are beginning to become standard on current cameras, so he is very easy to make a power extends for 3 times nothing, because the cables of the original transformer unfortunately far too short.
In short, excellent system, especially given the price.