I splashed out and bought a tin of goose fat for roast pots for Xmas. Had a go with it today.
It's not worth it!
They looked fab, really good.
They were nice and crispy - partly; but where mine would normally be crispy all over, these were most decidedly not.
They didn't taste any better, in fact were a bit of let down.
So, if you're only interested in what they look like it's worth it (eh, Nigella? Mine would have looked fab on tv too, you know.)
I won't be using it again.