i’ve used them on salmon and they do work there. To avoid conflicts with our wardens, we went to one hook per rig, which does cut your hook ups, but helps to size sort the strikes. Not sure how well it will work on bass THAT way, but BASS prohibiting them would seem to indicate they are effective. I still haven’t found anyone who has tried them on walleyes, and i would expect reduced utility, as walleyes don’t seem to have the trigger strike that bass do, but i do think they will work on northerns…