In the ponds that I have to manage they work great.Iam not a big fan of feeding a target fish but try to get a balance of all fish and as long as you start with a good forage base of either fathead or gambusia minnows then they grow and mature at a natural but fast pattern.I've seen alot of pond owners that feed and the cats get so big so fast they end up out growing the rest of the fish and up here where you cant feed most ly past oct. they can almost wipe out the bass and blue gill in one winter.If a person has a pond that is for just the target fish they feed then I say go ahead and feed them all they will eat .But I don't have alot of demand for that kind of ponds. Hope this helps explain Doc
