Looked at those about a year ago. Thought about them for trolling jigs & varying trolling depth by changing jig weights. But then figured I would just change jigs of different weights - plus it would "force" me to retie which I don't do nearly enough anyway. I was fishing Roosevelt a lot then so figured I'd just loose them in the trees so stuck to normal jig heads.
But if you're just vertical jiging them it could be beneficial.....
LLL