Blades used to be my #1 lures before I moved mostly to SP.
Bites. Same as said above - most of bites were when lure was resting on the bottom, so used mostly small hops. Sometimes added a bit of Xfactor. Usual catch - flathead, sometimes bream, trevally, whiting.
Price. Fishing (particularly for common (near)estuary species) can be usually as cheap or expensive as you want. My best performers were $2-3 blades from E bay. I used quality hooks though. Every blade has 2-3 holes to correct the action.
Snags. Remove rings and trebles, add doubles with hooks pointing toward tail. Hookup rates similar to trebles. Catches snags usually only during a strong side current.
Usage. I found hookup is more reliable with SP single hook than with blades, therefore now I use blades mostly only if Aussie SP piranhas (LJs) are around.