We only had one lock which did not work but I feel that the boat in front of us pushed the wrong button so after a while I started to push all the buttons and the system reset itself and we entered without human intervention. We did have a bit of a scare when a German fellow in a canoe joined us in the lock. As the gates opened he paddled out first and the gates started to close on our bow. A quick shift to astern and a press on the button saw the gates reopen and we exited vowing to run that silly red piece of plastic down. Unfortunately he followed us for three days on and off.
Generally the locks have a rise of 3.5 meters and no bollards in the wall so when you enter you have to either climb up the ladder set in the wall to loop your lines round the bollard or use a long boat hook to get a line around a bollard set back from the wall. Our guests were a great help to loop the lines and became quite proficient at the task. Ten out of ten score on most locks! Line with a twist minus 2 points.