Here too, we've been hammering the northerns. No better time than when they're in the spawn. Some of the bigger lakes haven't started to ice up yet though. Been a bit of a mild fall around here.
I just started using it this fall. I've done about 250 fish all around the 2.5 to 4.0 range. You have to give it time, let it do the work but after getting used to it it's much easier and more controllable for taking the filet off. I still go back to a conventional knife to remove the skins and debone the fish. But that is where the real advantage comes. Your knife stays sharp because you aren't cutting bones with it. I've only hit my knife on a stone 3 times this fall, a steel to roll the edge has kept it like a razor. I'm just a cold weather person. Can't stand dealing with fish or game meat when it's hot out.