My 2 cents on the Plopper is that it will certainly work at times. I like it when there is some chop on the water, flat glass, I like the walking baits and the wake baits. With this top water bite going strong, I like to have 3 rods on the deck, one with a walker, one with a waker, and one with a plopper.
I also like to follow up with a different bait, if I'm fishing a stretch of bank where there is TW activity and I pick some up on a bait, they'll seem to get tired of seeing it after a while. When that happens I'll switch to another TW bait, Usually they'll let you know what bait they want, could be the plopper, might be something else. It's good to have choices.