What's your species of primary interest, Bullhead? If it's trophy LMB that you're mainly after, PK may not make that much difference. If you're managing for trophy bluegill, though, they're a preferred food item for bluegill that could potentially make a big difference in the bluegill's overall growth.
I say "potentially" because I've only had them in one of my ponds for about two months, and am just adding them to a couple more. They're a pretty new management technique for trophy bluegill, but they occur naturally in a lot of places where bluegill get very big without management, such as FL and LA. I don't think you can lose with them; worst-case scenario is the bluegill and bass munch them all, and the fish still get a good growth spurt; best-case scenario is the PK establish in your pond and you have a new food source.
