No but looking at getting a couple from a freind to try out, as I dont want to splash out that much money on a buy if they are no good.
I see them more as just another string to the bow, and not sure if there are any advantages over the cage or the snare. I did consider using it in the urban garden, but then you have the issue of dispatch, as against taking the cage and fox, somewhere else to dispatch.
I can potentially see their use in areas where cage traps keep getting set off by nosey do-gooders!! or when you have a cage aware fox, possibly.