I've used it when necessary. I have two this year already. Usually occur in the paint. I usually try and do some preventive officiating telling them to play "straight up" or something. If one obviously initiates the contact I will call them for it - but sometimes, and for me it usually happens very early in the game or very late in the game - both competitors will start towards each other, or will touch and start leaning with an arm that goes to a full push like a couple of rhino's head to head. Then I'll hit them with the double.
And, like you, I have found this to be very effective in cleaning things up.
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