These are my papercutting knives, and the new swivel-headed one is the tiny one in the centre.
It cuts like a dream, though you have to control it so you don't just woosh off the line.
The orange one fits over the index finger — as you can see on the wrinkly old lady's hand in this pic! — so you get a good grip. It feels quite comfortable and secure, but takes some getting used to when you're cutting.
And this is a picture of winter in Perth!