Deep Hard bodies are a great option for trolling and casting deep water.  They are awesome for casting to steep banks with snags, as they get down to where the fish are with very little horizontal travel.  Deep trolling is also an option, such as in winter where fish typically hold in 20ft and deeper.  This Technique was used with success in Winter 2010 when Ian Kuccurs and Patrick Sebile trolled up some deep fish using Ultra deep Koolie Minnows in Tinaroo.  MH