It definitely works on Largemouth and the few times I've tried it I believe I had plenty of panfish bites, but most couldn't take the hook. The first fish I caught with it was a bluegill.
It wouldn't surprise me a bit if you caught walleye on it as well.
I think the key is that it needs to be suspending fish and fairly deep water. With reservoirs in the south, you have a lot of that near cover (shore). Up north, you usually have to get out in the middle. Remember, we're generally fishing about 10 ft. or more down.
It would make sense to me that if you could find a steep river bank that held fish, you'd probably do well with it.
Other than that, my theory is that FnF is just a southern version of ice fishing. It forces us to fish slow in much the same way the ice forces northern fisherpeople to fish slow.



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