I find them similar to using cranks in the summer, if there is an agressive bite they work great if the bite is slow they don't work as well. When the bite is on and they hit them, they usually inhale them, no nibble, nibble, just bang there on. I have an auto jigger that a buddy made out of a barbecue rotisarie, I fish them on the jigger quite a bit. I have the jigger set with about a 6-8" lift and then a 6-8 second delay on the drop. Some days the jigger has out fished me 3-1.
We can ice fish with two lines here