Very surprisingly, given their background, mine are incredibly gentle. Never ever even hinted at biting. Only times I was scratched was in the early days if I picked Boycat up (e.g. vet visit), he would panic so much to get away that his back claws would rip me as he pushed off in flight.
Girlcat has recently taken to kneading my hand VERY firmly during cuddles, but I doubt the multitude of tiny punctures will scar.