I went the cheap route and used dried cat food with fish flavour.
Just thrown a few handfuls over board every couple of minutes.
Seemed like it worked. Got some fish. But maybe I would have caught them without the burley anyway
Problem is that the stuff doesn't sink very quickly.
Might be better to put it into one of those burley nets with a rock to get it down to the bottom.
Good thing: cheap, easy and you don't have any stinky mess to deal with
Bad thing: might not be super effective
If people concentrated on the really important things in life, there'd be a shortage of fishing poles.