I use the Frabil orange ones with mixed success for pike. My wife gave me a "Jaw Jacker" for Christmas but I have yet to have an opportunity to use it. Looks like a good idea. We used to build something similar with a wooden "Y" frame that had a reel mounted to the tail and a mousetrap in the crotch of the y. Line went over the mousetrap trigger and through an eye hole down into the water. Fish bites, mousetrap goes off, sets the hook and pops a flag (old utility locating flags worked well). Cheap as borscht and we caught a pile of pike on them with Slader jigs and a minnow.

SS

"To be glad of life because it gives you a chance to love and to work and to play and to look up at the stars. To be satisfied with your possessions but not content with yourself until you have made the best of them."
-Henry Van Dyke