I just purchased one. Im waiting for it to show up. Everything i have heard and seen states that they are deadly for crappie. Also work well for the other species. I figure, if it dosnt work for me, ill give it to my 5 year old.
I have also read that that if you use them outside of the shanty, the littlest breeze can make your bait move/jig around.
Just my .02 on something i have not used YET!