The Williamson arrow head bucktail jig was one of the deadliest lures we used on a recent trip to the Dampier Peninsula in north west WA.  We caught at least a dozen different species of fish on them in a range of situations.  In this part of the world we rarely do any baitfishing for the simple fact that as soon as bait and berley goes in the water sharks appear on mass and usually help themselves to your catch.  Northwest WA has some of the largest tidal variations in the world and these jigs are ideal to use in a range of depths and throughout the tidal regime.  You can simply pull up on a reef and drift over it firing of a few casts with the jigs.  If the fish are there it doesn't take long to get a strike, otherwise you simply move on to the next reef. 
 
We mainly used the 2 ounce versions to simply get down quickly in 10-20m of water to the waiting hungry black jewfish on the bottom although often the jigs didn't make it that far as they got mopped up by big queenfish and trevally on the way down.  The best attributes of these jigs are their durability which includes a strong heavy gauge hook that you can't bend on standard threadline tackle and the white bucktail fur which stays on the jig despite constant hookups.  The trailing plastic got crunched pretty quickly, but these were easily replaced with 5 inch Slam softbaits.
 
One of the most memorable sessions using these jigs came on the last day of the trip when the black jew went crazy over them.  It was just a matter of dropping the jig down over the edge of the reef in the lee of the current and the hookups were instantaneous.

Check out all the action in Season 8 of Adventure Bound.