Sherri - I have used these for a couple years. They are very forceful. Better than any other traps, and way, way better than glue traps or poison. After using them, and seeing how they work, I think it is instant. With old style traps, I do not think they have enough force to be instant. Sometimes they are, but not always. The Ortho traps are.
I tried the live traps in the past. They just did not work. It is a nice idea to trap and release, but the trap has to catch them first, and I have not used any live traps that ever caught any mice.
